Add check for openSUSE when detecting bfd library

In ASTERISK-17842, some additional library checks were added to the configure
script so that the bfd library could be found on CentOS and Fedora systems.

As it turns out, openSUSE requires an additional library. This patch adds
another check to the configure script for openSUSE that will add that library.

Review: https://reviewboard.asterisk.org/r/2885/

(closes issue AST-1169)
Reported by: Guenther Kelleter
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Merged revisions 400073 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 400075 from http://svn.asterisk.org/svn/asterisk/branches/11
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git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@400078 f38db490-d61c-443f-a65b-d21fe96a405b
res_rtp_asterisk: Correct erroneous lost packet information in RTCP reports

RTCP's calculation of the number of lost packets in an RTP stream is based on
that stream's sequence number count, the number of received packets, and how
many packets we expect to receive. When the SSRC for an RTP stream changes,
there can - and almost always will be - a large jump in the next packet's
timestamp and sequence number. If we don't reset the number of received
packets, sequence number count, and other metrics used by RTCP, the next RR/SR
report will use the previous SSRC's values to calculate the lost packet count
for the new SSRC - resulting in a very large number of lost packets.

This patch modifies res_rtp_asterisk such that, if it detects a SSRC change, it
will reset the various values used by the RTCP calculations. From the
perspective of RTCP, this appears as a new media stream - which is what it is.

Review: https://reviewboard.asterisk.org/r/2886/

(closes issue AST-1174)
Reported by: Thomas Arimont
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Merged revisions 400089 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@400117 f38db490-d61c-443f-a65b-d21fe96a405b
res_pjsip_notify: Add documentation

We forgot to add documentation for res_pjsip_notify, which would prevent it
from being loaded. Whoops.

This patch also updates res_pjsip_notify to use pjsip_notify.conf, which now
has its own sample file in the configs directory as well.

Review: https://reviewboard.asterisk.org/r/2835/
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Merged revisions 400121 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@400122 f38db490-d61c-443f-a65b-d21fe96a405b