add 908-retry-seconds gateway param to set reg retry time when getting a 908 for backup interfaces to connect quickly

Merge pull request #86 in FS/freeswitch from ~HRISTO/freeswitch:proper-ptime-detection-with-packet-loss to master

* commit 'd48057e2':
  account for lost frames during ptime detection

mod_rayo: fix error in SRGS grammar parser... <one-of><item>7</item><item>715</item></one-of> will return MATCH_END with input of 7 instead of MATCH since 715 is a potential match with further input.

This allows the "broken ptime" detection to work correctly when packet
loss is present on the wire. In addition to the timestamps this patch
adds frame sequence tracking and corrects the timestamp difference
only as needed and according to the number of lost packets.

FS-6898 #resolve

This is a convenience option that can be passed to either
debian/bootstrap.sh or to debian/util.sh to include a module in the
build that would normally be excluded.  This option, -p, can be passed
multiple times.

If -t is passed to debian/util.sh, then we will import the
/etc/apt/sources.list mirrors and all apt keys into the
pbuilder/cowbuilder build environment.

This is useful e.g. when the FS build depends on a library not
available in Debian yet.

Normally we override the config of each pbuilder/cowbuilder image when
we update the image before using it for the build.  Passing this
option allows for using an existing cowbuilder image (assuming it's in
the correct location) with some existing desirable configuration.

The packaging for libsngtc-dev is not yet in Debian.

* commit '56535519':
  FS-5106 fire an event when a sip client doesn't respond to option-ping

fix obvious seg in setting a record file name to every participant and not checking for the recording member which does not have a session

* commit '490efb71':
  FS-6710: fix incorrect comparison for Min-SE values between SIP INVITE and local configuration

* commit 'eaaf9468':
  FS-6897: uuid_send_info enhancement that allows setting the Content-Type of the SIP INFO message

* commit '747322dc':
  Remove Contact header from BYE and CANCEL requests.

Merge pull request #65 in FS/freeswitch from ~MBRANCA/freeswitch:bugfix/OPENZAP-220-ftmod_libpri-don-t-close-channel to master

* commit '7ec7c920':
  OPENZAP-220 fix blocked into read and add cause for a correct hangup

    switch_pgsql.c switch_pgsql_next_result_timed() was using switch_time_now() for start time and switch_micro_time_now() for current time.  These are different time sources that may not be in sync and could cause the query to timeout prematurely.

FS-6781: #resolve #comment lets change this to always do confirm to match the other place where we set this

%FEATURE add bypass_media_resume_on_hold and bypass_media_after_hold variables to be set to true to enable these functions on a per channel basis

Per rfc3261 the Contact header is not applicable and MUST not appear in
the request.

FS-5868 #resolve