rtspsrc: Correctly parse RTSP 2.0 RTP-Info headers

These are actually different from RTSP 1.0 ones and failed to parse
before. As gst-rtsp-server produces RTSP 1.0 RTP-Info headers, still
handle parsing them for RTSP 2.0.

Fixes gstreamer/gst-plugins-good#834
33 jobs for !860 with rtspsrc-rtsp2-rtp-info in 47 seconds (queued for 5 seconds)
latest detached
Status Job ID Name Coverage
  Build Docker
passed #6846457
alpine amd64 manifest builder docker

00:00:27

passed #6846456
android docker

00:00:27

passed #6846455
cerbero fedora amd64 docker

00:00:33

passed #6846454
fedora amd64 docker

00:00:26

passed #6846458
gst-indent amd64 docker

00:00:26

 
  Preparation
passed #6846461
check allow-edit

00:00:11

passed #6846460
gst indent

00:00:13

manual #6846459
manual
manifest
 
  Build
created #6846470
gstreamer
build cerbero cross-android universal
created #6846474
gst-ios-14.3
build cerbero cross-ios universal
created #6846471
gstreamer
build cerbero cross win32
created #6846472
gstreamer
build cerbero cross win64
created #6846469
gstreamer
build cerbero fedora x86_64
created #6846473
gst-macos-11.1
build cerbero macos x86_64
created #6846475
docker windows gstreamer-windows 1809
build cerbero msvc x86_64
created #6846465
build clang fedora x86_64
created #6846468
docker windows 1809 allowed to fail manual
build msys2
created #6846462
build nodebug fedora x86_64
created #6846463
build static fedora x86_64
created #6846464
build static nodebug fedora x86_64
created #6846466
docker windows 1809
build vs2017 amd64
created #6846467
docker windows 1809
build vs2017 x86
 
  Test
created #6846476
gstreamer
check fedora
created #6846477
gstreamer
integration testsuites fedora 1/4
created #6846478
gstreamer
integration testsuites fedora 2/4
created #6846479
gstreamer
integration testsuites fedora 3/4
created #6846480
gstreamer
integration testsuites fedora 4/4
created #6846482
gstreamer
valgrind bad
created #6846483
gstreamer
valgrind ges
created #6846481
gstreamer
valgrind good
 
  Integrate
created #6846484
cross-android universal examples
created #6846486
gst-ios-14.3
cross-ios universal examples
created #6846485
documentation