Old code failed with:
```
11:34:01.536 [main] ERROR net.corda.node.internal.Node - Exception during node startup
java.nio.file.InvalidPathException: Illegal char <:> at index 2: /C:/Program%20Files/JetBrains/IntelliJ%20IDEA%20Community%20Edition%202017.3.1/lib/idea_rt.jar
at sun.nio.fs.WindowsPathParser.normalize(WindowsPathParser.java:182) ~[?:1.8.0_144]
at sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:153) ~[?:1.8.0_144]
at sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:77) ~[?:1.8.0_144]
at sun.nio.fs.WindowsPath.parse(WindowsPath.java:94) ~[?:1.8.0_144]
at sun.nio.fs.WindowsFileSystem.getPath(WindowsFileSystem.java:255) ~[?:1.8.0_144]
at java.nio.file.Paths.get(Paths.java:84) ~[?:1.8.0_144]
at net.corda.node.utilities.JVMAgentRegistry.resolveAgentJar(JVMAgentRegistry.kt:46) ~[classes/:?]
at net.corda.node.internal.AbstractNode.initialiseJVMAgents(AbstractNode.kt:785) ~[classes/:?]
at net.corda.node.internal.AbstractNode.start(AbstractNode.kt:199) ~[classes/:?]
at net.corda.node.internal.Node.start(Node.kt:335) ~[classes/:?]
at net.corda.node.internal.NodeStartup.startNode(NodeStartup.kt:146) ~[classes/:?]
at net.corda.node.internal.NodeStartup.run(NodeStartup.kt:120) [classes/:?]
at net.corda.node.Corda.main(Corda.kt:16) [classes/:?]
```
* 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
The problem with the previous implementation is that the transaction would be deserialized with the schema specified
in the serialized form, but the calculation of the id would involve re-serializing properties using a local serialization context
which might produce a different result.
Current logic in `CashWidget` is not handling well updates done in close succession, i.e. less than 1 second.
And such frequent updates do indeed happen, e.g. from: `net.corda.client.jfx.model.ContractStateModel#cashStates`
where `list` is modified twice.
Also use `.toDecimal()` instead of `.quantity`to have amount represented in pounds rather than in pennies.
(cherry picked from commit 952cc35)
* 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
* Update from v3
* Remove CordaInternal attribute as this is removed by v4 api-scanner plugin
* Make SerializationContext @DoNotImplement
* Addition of CordappConfig to contstructor of CordappContext
* Alteration of getOffset/getSize properties in ByteSequence, OpaqueBytes & OpaqueBytesSubSequence
* Make network parameters on MockServices final
