GStreamer 1.0: Move scripts to share folder

In !129 (merged) I put pipeline.sh in the bin folder, but it's not really an executable.
Granted our other files there are just python scripts, but pipeline.sh is more of a specific test case.

We should use the share folder for external scripts.

@daniel.tang suggests the following:

• share/configs --> share/scripts
• move our latest scripts into share/scripts/pre-O4 or share/scripts/gstreamer_python_upgrade
• share/debug_finalsink.patch --> share/patches/debug_finalsink.patch
• share/p_astro (from feature/p_astro/gstreamer_python_upgrade branch)
• share/sealgw (from feature/sealgw /gstreamer_python_upgrade branch)