aggregator: Wake up src pad task on reconfigure event

For instance, we want to resend the latency query, in case the upstream
latency has changed,
35 jobs for !707 with aggregator_wake_up_src_reconfigure in 5 minutes and 45 seconds (queued for 8 seconds)
latest detached
Status Job ID Name Coverage
  Build Docker
passed #5801907
alpine amd64 manifest builder docker

00:00:33

passed #5801906
android docker

00:00:30

passed #5801905
cerbero fedora amd64 docker

00:00:33

passed #5801904
fedora amd64 docker

00:05:21

passed #5801908
gst-indent amd64 docker

00:00:32

 
  Preparation
passed #5801910
gst indent

00:00:23

manual #5801909
manual
manifest
 
  Build
created #5801919
gstreamer
build cerbero cross-android universal
created #5801923
gst-ios-13.2
build cerbero cross-ios universal
created #5801920
gstreamer
build cerbero cross win32
created #5801921
gstreamer
build cerbero cross win64
created #5801918
gstreamer
build cerbero fedora x86_64
created #5801922
gst-macos-10.15
build cerbero macos x86_64
created #5801924
1809 gstreamer-windows windows docker
build cerbero msvc x86_64
created #5801914
build clang fedora x86_64
created #5801917
1809 windows docker allowed to fail manual
build msys2
created #5801911
build nodebug fedora x86_64
created #5801912
build static fedora x86_64
created #5801913
build static nodebug fedora x86_64
created #5801915
1809 windows docker
build vs2017 amd64
created #5801916
1809 windows docker
build vs2017 x86
 
  Test
created #5801925
gstreamer
check fedora
created #5801926
gstreamer
integration testsuites fedora 1/4
created #5801927
gstreamer
integration testsuites fedora 2/4
created #5801928
gstreamer
integration testsuites fedora 3/4
created #5801929
gstreamer
integration testsuites fedora 4/4
created #5801934
gstreamer
valgrind bad
created #5801931
gstreamer
valgrind base
created #5801930
gstreamer
valgrind core
created #5801935
gstreamer
valgrind ges
created #5801932
gstreamer
valgrind good
created #5801933
gstreamer
valgrind ugly
 
  Integrate
created #5801936
cross-android universal examples
created #5801938
gst-ios-13.2
cross-ios universal examples
created #5801937
documentation