verifier.sh: Improve debug output
Update git packages to kernel 3.15.4-1
repo.sh: Fix copy of source packages to backup

Previously an attempt would be made to copy the source packages in the i686 and
x86_64 directories to the backup. This would cause cp error out with "cp: will
not overwrite just created <file>". The fix envolved looping through
exist_pkg_mv_list and creating exist_pkg_mv_list_uniq without the i686 package
sources.