Restore metadata.xml files, now that we no longer blacklist them.

BUG=None
TEST=`equery m -U gzip` works now

Change-Id: I72612c73789b0c416c5c4e999101d3c59d0769a1
Reviewed-on: https://gerrit.chromium.org/gerrit/50715
Commit-Queue: Jim Hebert <jimhebert@chromium.org>
Reviewed-by: Jim Hebert <jimhebert@chromium.org>
Tested-by: Jim Hebert <jimhebert@chromium.org>
596 files changed