add 2 helper functions

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4643 43c1dc8c-776e-4df2-8ef1-6e829299be21
Use sockaddr_storage instead of sockaddr_in in sccp_protocol parse functions. Warn when receiving ipv6 addresses in skinny media/rtp message handling in sccp_actions.c (for now)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4644 43c1dc8c-776e-4df2-8ef1-6e829299be21