RestComm Media Server v5.1.0-alpha

This minor release provides minor performance enhancements and critical patches for DTLS negotiation.
It also features a new configuration for DTLS, where users can define supported cipher suite and use their own certificates. Also, ECDSA cipher is now support (and default) in order to maintain interoperability with latest versions of Chrome and Firefox.

Last but not least, RestComm Media Server 5.1.0 features a brand new feature to allow audio tracks to be cached in memory. It's a powerful feature that can greatly decrease network activity in the server!

Changelog:
#275 - Create documentation related to the new DTLS configuration
#272 - Ignore test BaseConnectionFSMTest1 explicitly
#263 - MGCP testsuite broken
#261 - MGCP stack doesnt trigger reverse DNS lookups
#257 - DTLS certificate configuration
#259 - Reduce Buffer overflow warnings to DEBUG level
#254 - Make DTLS cipher suite configurable
#247 - DTLS handler interop issue with Web SDK
#246 - DTLS handshake timeouts frequently
#235 - CnameGenerator takes too much time during class loading
#233 - Abort startup if configuration is not valid
#229 - Fix codecs informed in CRCX response
#252 - Added memory cache for audio tracks