rtpsession: Add disable-sr-timestamp property

The Onvif Streaming Spec, in section 6.11, mandates that when
Rate-Control is disabled potential RTCP packets shall have
their timestamps set to 0.

<https://www.onvif.org/specs/stream/ONVIF-Streaming-Spec.pdf>
15 jobs for <span class="ref-name">rtpsession-timestamp-srs</span> in 56 minutes and 13 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Preparation
passed #217677
gst indent

00:00:17

passed #217676
manifest

00:00:28

 
  Build
passed #217678
build fedora x86_64

00:05:36

passed #217695
build nodebug fedora x86_64

00:04:10

failed #217679
build nodebug fedora x86_64

00:03:59

 
  Test
passed #217680
check fedora

00:03:33

passed #217681
integration testsuites fedora

00:08:16

 
  Full Builds
passed #217683
build cerbero android universal

00:12:32

passed #217684
build cerbero cross win32

00:08:49

passed #217685
build cerbero cross win64

00:07:01

passed #217682
build cerbero fedora x86_64

00:07:28

 
  Full Tests
passed #217687
valgrind bad

00:09:10

passed #217714
valgrind good

00:09:07

failed #217686
valgrind good

00:14:20

 
  Apps
passed #217688
android universal examples

00:06:51