Added support for local source address to TcpOutput plugin
Updating naming convention of struct members and configuration options.
Updated documentation to reflect the incompatibility of use_tls and local_address
Added a check on TcpOutput init to error if both use_tls and local_address are set
Correct documentation for incorrect local_address field in example.
Merge pull request #781 from brokenjacobs/dev

Added support for local source address to TcpOutput plugin