NIFI-3162: Audit RPG and RPG port config changes

[ijokarumawak]

• Added configure audits for Transport Protocol, HTTP Proxy Server Host,
  Port, User and Password in RemoteProcessGroup configuration
• Added configure audits for enabling/disabling individual remote port
• Added configure audits for Concurrent Tasks and Compressed in Remote
  Port configuration

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[mcgilman]

Will review...

[mcgilman]

@ijokarumawak Thanks! This has been merged to master.