Add classpath isolation

[remmeier]

The deployNodes task is need need of quite a number of dependencies for its execution (Guava, Bouncycastle). In a larger multi-project Gradle project I run into problems because of versioning issues of the dependencies. I did not analyze the issue in detail. I guess some of those dependencies come from the Gradle classpath rather than the application compile classpath. It would be great if the plugin runs more or less fully isolated. Some typical patterns are using a custom classloader isolated from the Gradle classloader or using https://github.com/project-aries/docker-java-shaded.

I managed to get it working by adding all the corda dependencies onto the Gradle classpath, but that is something I really do not want to do:

buildscript{
dependencies{
classpath "net.corda:corda-core:$corda_release_version"
classpath "net.corda:corda-finance:$corda_release_version"
classpath "net.corda:corda-jackson:$corda_release_version"
classpath "net.corda:corda-rpc:$corda_release_version"
classpath "net.corda:corda-webserver-impl:$corda_release_version"
classpath "net.corda:corda:$corda_release_version"
classpath "net.corda:corda-webserver:$corda_release_version"
..
}
}