test_esplora_syncs is flaky

[TheBlueMatt]

MacOS tests of #2434 said

failures:

---- test_esplora_syncs stdout ----
thread 'test_esplora_syncs' panicked at 'called `Result::unwrap()` on an `Err` value: JsonRpc(Rpc(RpcError { code: -4, message: "Wallet file verification failed. SQLiteDatabase: Unable to obtain an exclusive lock on the database, is it being used by another instance of Bitcoin Core?\n", data: None }))', tests/integration_tests.rs:27:70
stack backtrace:
   0: rust_begin_unwind
             at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/std/src/panicking.rs:593:5
   1: core::panicking::panic_fmt
             at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/core/src/panicking.rs:67:14
   2: core::result::unwrap_failed
             at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/core/src/result.rs:1651:5
   3: core::result::Result<T,E>::unwrap
error: test failed, to rerun pass `--test integration_tests`
             at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/core/src/result.rs:1076:23
   4: integration_tests::setup_bitcoind_and_electrsd
             at ./tests/integration_tests.rs:27:17
   5: integration_tests::test_esplora_syncs::{{closure}}
             at ./tests/integration_tests.rs:245:29
   6: <core::pin::Pin<P> as core::future::future::Future>::poll
             at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/core/src/future/future.rs:125:9
   7: <core::pin::Pin<P> as core::future::future::Future>::poll
             at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/core/src/future/future.rs:125:9
   8: tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}::{{closure}}::{{closure}}
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/scheduler/current_thread.rs:651:57
   9: tokio::runtime::coop::with_budget
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/coop.rs:107:5
  10: tokio::runtime::coop::budget
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/coop.rs:73:5
  11: tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}::{{closure}}
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/scheduler/current_thread.rs:651:25
  12: tokio::runtime::scheduler::current_thread::Context::enter
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/scheduler/current_thread.rs:410:19
  13: tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/scheduler/current_thread.rs:650:36
  14: tokio::runtime::scheduler::current_thread::CoreGuard::enter::{{closure}}
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/scheduler/current_thread.rs:729:68
  15: tokio::runtime::context::scoped::Scoped<T>::set
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/context/scoped.rs:40:9
  16: tokio::runtime::context::set_scheduler::{{closure}}
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/context.rs:176:26
  17: std::thread::local::LocalKey<T>::try_with
             at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/std/src/thread/local.rs:270:16
  18: std::thread::local::LocalKey<T>::with
             at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/std/src/thread/local.rs:246:9
  19: tokio::runtime::context::set_scheduler
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/context.rs:176:9
  20: tokio::runtime::scheduler::current_thread::CoreGuard::enter
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/scheduler/current_thread.rs:729:27
  21: tokio::runtime::scheduler::current_thread::CoreGuard::block_on
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/scheduler/current_thread.rs:638:19
  22: tokio::runtime::scheduler::current_thread::CurrentThread::block_on::{{closure}}
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/scheduler/current_thread.rs:175:28
  23: tokio::runtime::context::runtime::enter_runtime
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/context/runtime.rs:65:16
  24: tokio::runtime::scheduler::current_thread::CurrentThread::block_on
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/scheduler/current_thread.rs:167:9
  25: tokio::runtime::runtime::Runtime::block_on
             at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.29.1/src/runtime/runtime.rs:311:47
  26: integration_tests::test_esplora_syncs
             at ./tests/integration_tests.rs:305:2
  27: integration_tests::test_esplora_syncs::{{closure}}
             at ./tests/integration_tests.rs:244:31
  28: core::ops::function::FnOnce::call_once
             at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/core/src/ops/function.rs:250:5
  29: core::ops::function::FnOnce::call_once
             at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.


failures:
    test_esplora_syncs

test result: FAILED. 1 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 17.96s

[tnull]

This is weird as after #2132 the Drop of BitcoinD should clean up any remaining state. (cc @RCasatta)