made checkarchtag.py work with baz only and not with tla.
Patches applied:

 * steve.alexander@canonical.com/launchpad--devel--0--patch-231
   refuel

 * steve.alexander@canonical.com/launchpad--devel--0--patch-232
   refuel

 * steve.alexander@canonical.com/launchpad--devel--0--patch-233
   refuel

 * steve.alexander@canonical.com/launchpad--devel--0--patch-234
   refuel

 * steve.alexander@canonical.com/launchpad--devel--0--patch-235
   refuel

 * steve.alexander@canonical.com/launchpad--devel--0--patch-236
   removed bizarre code to make this checkarchtag compatible with tla or baz.  checkarchtag is now compatible with baz only.

 * steve.alexander@canonical.com/launchpad--devel--0--patch-237
   refuel