[FABRIC-407] Stop scripts now wait for the pid to die before deleting the container.
[FABRIC-407] Fix kill script so that it can wait on processes that are not children of the current shell.
Make feature itests more parallel when using multiple containers.
[FABRIC-406] Validate container and profile names in fabric commands.
[FABRIC-408] Limit retriable zookeeper requests inside ZookeeperClusterServiceImpl. Tune retry policy.
[FABRIC-404] The maven proxy now only performs one artifact request per concurrent http requests. Threads that request the same path while the request is pending will wait on the request.