Remember session timeout(s) and use it when session gets completed.

Add "U" command, which is like "D" but for cases when DTLS

session has been created when going from insecure to secure.

Part II of pipelining RTP processing: hook up relay_packet into

pproc_manager() framework. Add PPROC_ACT_DROP to notify when
packet is to be dropped, add new method pproc_manager_handleat()
to inject packet at the specified point. Make handle() / handleat()
methods to deal with derefing packets and update drop counter.

Adjust to account for MEMDEB output from the extractaudio.

Merge pull request sippy#113 from CyBHFal/rtpp_2_1

Error in backport to correct issue sippy#111

Undo damage in 7be7d55.

Use memmove() instead of memcpy() since regions may overlap.

Add an option to output both realtime and monotime.

Include <stdarg.h> to make sure va_list is defined.

Shut down non-datagram sockets that got I/O error

and also all non-continuous UNIX sockets are recycled
after each use. This should fix spurious empty command
that we are receiving on the non-continuous unix socket
from time to time.