Prior to this change it was intermittently failing with:
```
net.corda.client.rpc.RPCException: RPC server is not available.
at net.corda.client.rpc.internal.RPCClientProxyHandler.invoke(RPCClientProxyHandler.kt:222)
at com.sun.proxy.$Proxy79.ping(Unknown Source)
at net.corda.client.rpc.RPCStabilityTests$client reconnects to rebooted server$1$pingFuture$1.invoke(RPCStabilityTests.kt:251)
at net.corda.client.rpc.RPCStabilityTests$client reconnects to rebooted server$1$pingFuture$1.invoke(RPCStabilityTests.kt:36)
at net.corda.core.internal.concurrent.ValueOrException$DefaultImpls.capture(CordaFutureImpl.kt:107)
at net.corda.core.internal.concurrent.OpenFuture$DefaultImpls.capture(CordaFutureImpl.kt:65535)
at net.corda.core.internal.concurrent.CordaFutureImpl.capture(CordaFutureImpl.kt:119)
at net.corda.core.internal.concurrent.CordaFutureImplKt$fork$$inlined$also$lambda$1.run(CordaFutureImpl.kt:22)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
```
* Improve error reporting in case of failure of flaky tests
Also eliminate warnings and other minor changes.
* Address code review comments raised by @exFalso
Also improve output for stack traces.
* rework message handling while connection is down: do not send anything, throw on all obs and futures when failure detected
* RPC calls will throw if used during failover; adapted tests
ENT-1575 Add db migrations for db attachment changes,
ENT-1566 Fixes for db integration tests -following changes in CORDA-926 (obligatory node properties), upgrade db schema setup in draining mode/RPC tests, set runMigration=true in properties files for db tests, add new tables for deletion in SQL setup scrips
Updated db integration tests description in testing.rst
* CORDA-296: added handler for connection failover
print rpc address during node startup
* address PR comments: typo, whitespace, onError observables
* reworked rpc client msg buffering to avoid race conditions when failure happens while the request is being prepared to be sent; added unit test for 8 threads sharing same client sending 1000 requests
* decreased sleep time in rpc test, code cleanup
- Existing embedded Shell connects via RPC including checking RPC user credentials (before was a direct use of CordaRPCOps): in dev mode when console terminal is enabled, node created `shell` user.
- New Standalone Shell app with the same functionalities as Shell: connects to a node via RPC Client, can use SSL and run SSH server.
* Remove sslConfiguration from public constructor of CordaRPCClient
* Address review comments
* Update api-current.txt
* sslConfiguration doesn't need to be a property
Minor tweaks to the invocation context code.
1) Un-deprecate FlowInitiator, move the deprecation to the field. This
eliminates large numbers of warnings and means developers are warned
only once in the place where they obtain one.
2) Add documentation for StateMachineInfo and create a type alias to give
it a better name in an ABI compatible way.
3) Improve markup on InvocationContext
4) Rename field from just "context" to "invocationContext" (Context is vague)
* Sql setup scripts for Oracle and datasource configuration.
* CashSelection for Oracle.
* Workaround of forbidden distinct for BLOBs.
* ojdbc8.jar driver dependency from Oracle Maven repository, ojdbc6.jar from lib (it's not in Maven repo).
* allow to use random Port in node names and trim it from schema name, remove schema with port numbers from db setup (to cater for new test, non Oracle specific change)
* Removed unnecessary code from ConfigUtilities (non Oracle specific change)
* Removed db integration tests setup for RPCStabilityTest as it doesn't start any nodes
* Change JDBC drivers dependencies to integrationTestRuntimeOnly
* Added smoke test validating JDBC driver registration located in "./plugins" directory
* Some docsite tweaks
* [ENT-1281]: set database.runMigration=false by default and add state check at startup
* [ENT-1281]: attempt to fix tests
* [ENT-1281]: attempt to fix tests
* [ENT-1281]: set runMigration=true in the cordformation plugin
* [ENT-1281]: attempt to fix tests
* [ENT-1281]: attempt to fix tests
* [ENT-1281]: attempt to fix tests
* [ENT-1281]: fix formatting
* [ENT-1281]: typo and javadocs
* [ENT-1281]: small refactoring and added test for SchemaMigration
* [ENT-1281]: update documentation to reflect changes
* [ENT-1281]: fix tests after merge
* [ENT-1339]: for h2, allow schemas without migrations to run (#294)
* [ENT-1339]: for h2, allow schemas without migrations to run
* [ENT-1339]: fix various migration issues and change author name
* [ENT-1339]: add naming convention for migrations
* [ENT-1339]: change naming convention to use hyphens
* [ENT-1339]: change mapping of participants to be able to control the table name
* [ENT-1339]: change FK names to <=30 for oracle 11g compatibility
* [ENT-1339]: cmd line argument for migrations made consistent
* [ENT-1339]: revert abstract state superclasses
* Update db integration test setup - new tables.
* Update db integration test setup - new tables.
* [ENT-1339]: remove final from participants to allow table name config
* [ENT-1339]: shortened pk
* [ENT-1339]: revert constructor
* [ENT-1339]: change getMigrationResource api to Nullable
* fix compile error
* [ENT-1281]: fix tests after merge
* [ENT-1281]: fix tests after merge
