Fix hold/unhold in bridge_native_rtp, use tech_pvt instead of bridge_pvt, reduce bridging attempts, and fix breaking native RTP bridges.

(closes issue ASTERISK-22128)

(closes issue ASTERISK-22104)


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@395866 f38db490-d61c-443f-a65b-d21fe96a405b
Remove "constant" endpoint identifier.

This was created as a debugging tool before proper endpoint identifiers
were created. Using it now can actually lead to harmful results.



git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@395868 f38db490-d61c-443f-a65b-d21fe96a405b