Add the front end mechanism to load the typeahead for the git revision
field on importing a layer.
Also fix one indentation issue and update the js test.
(Bitbake rev: 28114be42174095b812a93d4b5a0e01e953d74f8)
Signed-off-by: Michael Wood <michael.g.wood@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>