Remove deprecated extension "tag" and "tag-ext"

These two extensions are deprecated in favor of "standard-attr-tag".
This commit removes these two extensions from the extension list
of the zuul jobs. The tests that required legacy extensions are
updated to require the new extension "standard-attr-tag" instead.

Change-Id: I9a991a89a5de1dfd9e9134746b3ea4835fed1dae
2 files changed