Since we are running web-server and different handling methods will be called from
different threads, it is more appropriate to use concurrent data structures
for exchanging information between threads.
Prior to this change I observed the following exception which is likely to be due `certPaths` not synchronized between threads:
```
Caused by: kotlin.KotlinNullPointerException
at net.corda.node.utilities.registration.RegistrationHandler$reply$1.invoke(NodeRegistrationTest.kt:151) ~[integrationTest/:?]
at net.corda.node.utilities.registration.RegistrationHandler$reply$1.invoke(NodeRegistrationTest.kt:122) ~[integrationTest/:?]
at net.corda.core.internal.InternalUtils.logElapsedTime(InternalUtils.kt:221) ~[corda-core-corda-4.0-snapshot.jar:?]
at net.corda.core.internal.InternalUtils.logElapsedTime(InternalUtils.kt:213) ~[corda-core-corda-4.0-snapshot.jar:?]
at net.corda.node.utilities.registration.RegistrationHandler.reply(NodeRegistrationTest.kt:149) ~[integrationTest/:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_161]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_161]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_161]
```
Packages re-jig was meant to reduce the size of the jars that are being produced by the
node driver. E.g. previously `MessageState` was in package `net.corda` which resulted in jar file
of around 2MB to be created. Same for `NodeStatePersistenceTests` which was in `net.corda.node`
* Improve logging for NetworkMap requests
* Allow interrupt in polling if the process started successfully
* Put `advertiseNewParameters` back
* Additional log line to indicate when all the nodes are started
* Improve logging and use concurrent map since it is updated from multiple threads
* Change NetworkMap response validity duration and rename parameter accordingly
* Changes following code review from @shamsasari
* Instantiating the contract class should be part of contract verification. We should not instantiate it while building LedgerTransaction.
* Also catch any exceptions from instantiating the contract.
* Making Corda's JPA classes non-final and Serializable.
* Making Corda's JPA classes non-final and Serializable.
* Making Corda's JPA classes non-final and Serializable.
* Making Corda's JPA classes non-final and Serializable.
