gstelement: prevent scheduling policies to propagate

Prevent other scheduling policies then SCHER_OTHER,
e.g. SCHER_RR policy,to propagate to the pipeline
internal threads.
17 jobs for topic/mats/scheduling_priority in 49 minutes and 1 second (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Preparation
passed #267584
gst indent

00:00:20

passed #267583
manifest

00:00:43

 
  Build
passed #267585
build fedora x86_64

00:04:58

passed #267586
build nodebug fedora x86_64

00:04:15

 
  Test
passed #267587
check fedora

00:05:57

passed #267588
integration testsuites fedora

00:07:53

 
  Full Builds
passed #267590
build cerbero android universal

00:12:17

passed #267591
build cerbero cross win32

00:04:35

passed #267592
build cerbero cross win64

00:05:49

passed #267589
build cerbero fedora x86_64

00:05:40

 
  Full Tests
passed #267597
valgrind bad

00:12:03

passed #267594
valgrind base

00:15:15

passed #267593
valgrind core

00:16:40

passed #267598
valgrind ges

00:03:33

passed #267595
valgrind good

00:15:37

passed #267596
valgrind ugly

00:02:23

 
  Apps
passed #267599
android universal examples

00:06:26