common: use https protocol for common submodule
common: use https protocol for common submodule

https://bugzilla.gnome.org/show_bug.cgi?id=775110

varunkumara/test-repo,CapOM/gst-omx,CapOM/gst-omx,varunkumara/test-repo,GStreamer/gst-omx,CapOM/gst-omx,GStreamer/gst-omx,GStreamer/gst-omx,varunkumara/test-repo