storage/sql: use isolation level "serializable" for transactions

[ericchiang]

Still need to test this with the kubernetes third party resources.

closes #628
closes #600

[ericchiang]

woops, this is the wrong format string

[ericchiang]

wow, this works with kubernetes as well

$ env | grep DEX_
DEX_POSTGRES_HOST=172.16.28.4
DEX_KUBECONFIG=/home/eric/src/github.com/coreos/coreos-baremetal/examples/assets/tls/kubeconfig
$ go test -v -race github.com/coreos/dex/storage/...
?       github.com/coreos/dex/storage   [no test files]
?       github.com/coreos/dex/storage/conformance   [no test files]
=== RUN   TestIDToName
--- PASS: TestIDToName (0.01s)
=== RUN   TestNamespaceFromServiceAccountJWT
--- PASS: TestNamespaceFromServiceAccountJWT (0.00s)
=== RUN   TestLoadClient
2016/10/31 20:57:59 third party resource already created "auth-code.oidc.coreos.com"
2016/10/31 20:57:59 third party resource already created "auth-request.oidc.coreos.com"
2016/10/31 20:57:59 third party resource already created "o-auth2-client.oidc.coreos.com"
2016/10/31 20:57:59 third party resource already created "signing-key.oidc.coreos.com"
2016/10/31 20:57:59 third party resource already created "refresh-token.oidc.coreos.com"
2016/10/31 20:57:59 third party resource already created "password.oidc.coreos.com"
--- PASS: TestLoadClient (0.11s)
=== RUN   TestURLFor
--- PASS: TestURLFor (0.00s)
=== RUN   TestStorage
2016/10/31 20:57:59 third party resource already created "auth-code.oidc.coreos.com"
2016/10/31 20:57:59 third party resource already created "auth-request.oidc.coreos.com"
2016/10/31 20:57:59 third party resource already created "o-auth2-client.oidc.coreos.com"
2016/10/31 20:57:59 third party resource already created "signing-key.oidc.coreos.com"
2016/10/31 20:57:59 third party resource already created "refresh-token.oidc.coreos.com"
2016/10/31 20:57:59 third party resource already created "password.oidc.coreos.com"
=== RUN   TestStorage/AuthCodeCRUD
=== RUN   TestStorage/AuthRequestCRUD
=== RUN   TestStorage/ClientCRUD
=== RUN   TestStorage/RefreshTokenCRUD
=== RUN   TestStorage/PasswordCRUD
=== RUN   TestStorage/KeysCRUD
=== RUN   TestStorage/GarbageCollection
=== RUN   TestStorage/AuthRequestConcurrentUpdate
=== RUN   TestStorage/ClientConcurrentUpdate
=== RUN   TestStorage/PasswordConcurrentUpdate
=== RUN   TestStorage/KeysConcurrentUpdate
--- PASS: TestStorage (0.53s)
    --- PASS: TestStorage/AuthCodeCRUD (0.03s)
    --- PASS: TestStorage/AuthRequestCRUD (0.03s)
    --- PASS: TestStorage/ClientCRUD (0.04s)
    --- PASS: TestStorage/RefreshTokenCRUD (0.02s)
    --- PASS: TestStorage/PasswordCRUD (0.05s)
    --- PASS: TestStorage/KeysCRUD (0.04s)
    --- PASS: TestStorage/GarbageCollection (0.06s)
    --- PASS: TestStorage/AuthRequestConcurrentUpdate (0.03s)
    --- PASS: TestStorage/ClientConcurrentUpdate (0.04s)
    --- PASS: TestStorage/PasswordConcurrentUpdate (0.04s)
    --- PASS: TestStorage/KeysConcurrentUpdate (0.04s)
PASS
ok      github.com/coreos/dex/storage/kubernetes    1.669s
?       github.com/coreos/dex/storage/kubernetes/k8sapi [no test files]
=== RUN   TestStorage
=== RUN   TestStorage/AuthCodeCRUD
=== RUN   TestStorage/AuthRequestCRUD
=== RUN   TestStorage/ClientCRUD
=== RUN   TestStorage/RefreshTokenCRUD
=== RUN   TestStorage/PasswordCRUD
=== RUN   TestStorage/KeysCRUD
=== RUN   TestStorage/GarbageCollection
--- PASS: TestStorage (0.03s)
    --- PASS: TestStorage/AuthCodeCRUD (0.00s)
    --- PASS: TestStorage/AuthRequestCRUD (0.00s)
    --- PASS: TestStorage/ClientCRUD (0.00s)
    --- PASS: TestStorage/RefreshTokenCRUD (0.00s)
    --- PASS: TestStorage/PasswordCRUD (0.03s)
    --- PASS: TestStorage/KeysCRUD (0.00s)
    --- PASS: TestStorage/GarbageCollection (0.00s)
=== RUN   TestStaticClients
--- PASS: TestStaticClients (0.00s)
PASS
ok      github.com/coreos/dex/storage/memory    1.049s
=== RUN   TestSQLite3
=== RUN   TestSQLite3/AuthCodeCRUD
=== RUN   TestSQLite3/AuthRequestCRUD
=== RUN   TestSQLite3/ClientCRUD
=== RUN   TestSQLite3/RefreshTokenCRUD
=== RUN   TestSQLite3/PasswordCRUD
=== RUN   TestSQLite3/KeysCRUD
=== RUN   TestSQLite3/GarbageCollection
--- PASS: TestSQLite3 (0.20s)
    --- PASS: TestSQLite3/AuthCodeCRUD (0.02s)
    --- PASS: TestSQLite3/AuthRequestCRUD (0.02s)
    --- PASS: TestSQLite3/ClientCRUD (0.02s)
    --- PASS: TestSQLite3/RefreshTokenCRUD (0.03s)
    --- PASS: TestSQLite3/PasswordCRUD (0.05s)
    --- PASS: TestSQLite3/KeysCRUD (0.03s)
    --- PASS: TestSQLite3/GarbageCollection (0.02s)
=== RUN   TestPostgres
=== RUN   TestPostgres/AuthCodeCRUD
=== RUN   TestPostgres/AuthRequestCRUD
=== RUN   TestPostgres/ClientCRUD
=== RUN   TestPostgres/RefreshTokenCRUD
=== RUN   TestPostgres/PasswordCRUD
=== RUN   TestPostgres/KeysCRUD
=== RUN   TestPostgres/GarbageCollection
=== RUN   TestPostgres/AuthRequestConcurrentUpdate
=== RUN   TestPostgres/ClientConcurrentUpdate
=== RUN   TestPostgres/PasswordConcurrentUpdate
=== RUN   TestPostgres/KeysConcurrentUpdate
--- PASS: TestPostgres (0.28s)
    --- PASS: TestPostgres/AuthCodeCRUD (0.02s)
    --- PASS: TestPostgres/AuthRequestCRUD (0.02s)
    --- PASS: TestPostgres/ClientCRUD (0.02s)
    --- PASS: TestPostgres/RefreshTokenCRUD (0.01s)
    --- PASS: TestPostgres/PasswordCRUD (0.03s)
    --- PASS: TestPostgres/KeysCRUD (0.03s)
    --- PASS: TestPostgres/GarbageCollection (0.03s)
    --- PASS: TestPostgres/AuthRequestConcurrentUpdate (0.02s)
    --- PASS: TestPostgres/ClientConcurrentUpdate (0.02s)
    --- PASS: TestPostgres/PasswordConcurrentUpdate (0.04s)
    --- PASS: TestPostgres/KeysConcurrentUpdate (0.04s)
=== RUN   TestDecoder
--- PASS: TestDecoder (0.00s)
=== RUN   TestEncoder
--- PASS: TestEncoder (0.00s)
=== RUN   TestMigrate
--- PASS: TestMigrate (0.02s)
=== RUN   TestTranslate
--- PASS: TestTranslate (0.00s)
PASS
ok      github.com/coreos/dex/storage/sql   1.508s