MULE-7097: Provide a way to specify valid cipher specs for SSL on transports that support the protocol

Added a configuration file for custom cipher suites and protocols.
MULE-7097: Provide a way to specify valid cipher specs for SSL on transports that support the protocol

Changes after code review
Merge pull request #231 from mulesoft/MULE-7097

MULE-7097: Provide a way to specify valid cipher specs for SSL on transports that support the protocol