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

Changed value of the enabledProtocols property in the tls-default.conf file so that SSLv3 is not used by default.
Merge pull request #1107 from mulesoft/MULE-7097

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