Added plugin file to gitignore
Make the JobClient of the LocalFlinkMiniCluster reusable.
Exclude plugin file from rat.
Started reworking of test cases
Finished rewriting of test cases
Fix scala style issues
Add option to use single actor system for local execution. Use local connection manager if a single task manager is used for local execution. Remove synchronized blcok in getReceiverList of ChannelManager which effectively serialized the connection lookup calls of a single task manager.