go/worker/keymanager: Show current key manager policy in the node status

[peternose]

Before first init request:

> keymanager-0 oasis-node control status
{
  "keymanager": {
    "signed_policy": null,
    "policy_checksum": null
  }
}

After first init request:

> keymanager-0 oasis-node control status
{
  "keymanager": {
    "signed_policy": null,
    "policy_checksum": ""
  }
}

With (sample) policy:

> keymanager-0 oasis-node control status
{
  "keymanager": {
    "signed_policy": {
      "policy": {
        "serial": 1,
        "id": "c000000000000000ffffffffffffffffffffffffffffffffffffffffffffffff",
        "enclaves": {
          "yaWJhRsfNWJxd/1wN47XeBcPc3YR5N+/C20lvf9VtHR9MQZkeAkxrhA6swqQFxwgGvOFpydXu0aDV4/evemt9Q==": {
            "may_query": {
              "8000000000000000000000000000000000000000000000000000000000000000": [
                "GCVveDwHFSG+LaBBzZNHtb21qO9Y+zRlhXGm4Uzx/LDkgEnR3g6zM1I5kWcabJO5fdZbzwknPVtr/oJi3JaOxw=="
              ]
            },
            "may_replicate": [
              "dW6vdvVILFNFgIserM3Vxg+GS7KqLSuHDfAM5DWvTiM1l6L/B0MBbyjl1+EpME7hxD29rj26lOGc7jVJA4paMg=="
            ]
          }
        }
      },
      "signatures": []
    },
    "policy_checksum": "BR0LqY6VQbk/xGezjRGk+tnb8gsGZT5wK24OkXlZmAE="
  }
}

[codecov]

Codecov Report

Merging #5079 (a4ed204) into master (2e9b0ff) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5079      +/-   ##
==========================================
- Coverage   67.22%   67.21%   -0.01%     
==========================================
  Files         501      501              
  Lines       53265    53269       +4     
==========================================
- Hits        35805    35803       -2     
  Misses      13128    13128              
- Partials     4332     4338       +6     

Impacted Files	Coverage Δ
go/worker/keymanager/api/api.go	32.43% <ø> (ø)
go/worker/keymanager/status.go	83.33% <100.00%> (+0.72%)	⬆️
go/worker/keymanager/worker.go	65.65% <100.00%> (+0.79%)	⬆️
...onsensus/tendermint/apps/beacon/state/state_vrf.go	73.33% <0.00%> (-13.34%)	⬇️
go/worker/beacon/tx_retry.go	90.47% <0.00%> (-4.77%)	⬇️
go/scheduler/api/api.go	53.26% <0.00%> (-4.35%)	⬇️
go/sentry/api/grpc.go	40.62% <0.00%> (-3.13%)	⬇️
go/worker/keymanager/watcher.go	64.17% <0.00%> (-2.99%)	⬇️
go/runtime/host/multi/multi.go	75.00% <0.00%> (-2.21%)	⬇️
go/p2p/peermgmt/connector.go	98.16% <0.00%> (-1.84%)	⬇️
... and 29 more

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