* CORDA-1393: Install `onError()` handler for folding action
or else `ErrorNotImplementedAction` will be invoked which is never a good thing
* CORDA-1335: Improve exception handling in `cleanUpOnConnectionLoss()`
* CORDA-1335: Try to trick the logic to pretend we are running in HA mode to have a chance of re-connecting.
* CORDA-1416: Make `NodeMonitorModel` code react to proxy changing.
* CORDA-1416: Workaround `CordaRPCOps.equals()` calls when listener dispatching change.
* CORDA-1416: Increase re-try interval to allow enough time for server to come back online.
* CORDA-1355: Properly close RPC connection we are moving away from.
* CORDA-1355: Unsubscribe on Error to prevent propagation of it downstream.
* CORDA-1355: For downstream subscribers ignore errors properly. Thanka to @exfalso for the hint.
This fixes: Transaction Updates do not flow after re-connect
* CORDA-1355: Bugfix eliminate duplicating items on "Transactions" blotter after re-connect.
* CORDA-1355: Bugfix eliminate double counting on dashboards.
* CORDA-1355: Bugfix eliminate same parties in dropdowns.
* CORDA-1355: Stop using `SecureHash.randomSHA256()` for painting widget icon.
Instead use combined SHA hash such that icon represents the whole population of trades.
That way two transactions blotters can be compared by a single glimpse at corresponding icons.
Also minor refactoring.
* CORDA-1416: Make RPC re-connection faster/more robust.
* CORDA-1416: Properly announce thet Proxy may not be available during re-connect and prevent UI crashing.
* CORDA-1416: Disable UI until RPC proxy is available.
* CORDA-1416: Correct typo.
* CORDA-1416: Unit test fix.
* CORDA-1416: GUI cosmetic changes.
* CORDA-1416: Correct spaces.
* CORDA-1416: Remove un-necessary overrides in CordaRPCOpsWrapper.
* CORDA-1416: Switch from using `doOnError` to installing an error handler upon subscription.
* ENT-1670: update kdocs and unit test for better user experience regarding
RPC connection loss
* RPCStabilityTests: move doOnError logic to onError handler
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.
