This tool is not being used and not being maintained anymore. Remove it
so we don't have to keep solving new issues shown by shellcheck like:

	In qf line 81:
		branch=${quilt_branch#$QUILT_PREFIX}
				      ^-----------^ SC2295 (info): Expansions inside ${..} need to be quoted separately, otherwise they match as patterns.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>