bitbake: toaster: layerdetails api Fix saving of git revision of a layer

Update, clean up and move the api for updating a layerversion from the
views to api. Also update the layerdetails page to include the
layerversion id in the url getter.

[YOCTO #8952]

(Bitbake rev: 20f4e23bc86290f0a42881a7cac44c41eafa86fc)

Signed-off-by: Michael Wood <michael.g.wood@intel.com>
Signed-off-by: Elliot Smith <elliot.smith@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/toastergui/urls.py

@@ -190,7 +190,10 @@ urlpatterns = patterns('toastergui.views',
             name='xhr_configvaredit'),
 
         url(r'^xhr_importlayer/$', 'xhr_importlayer', name='xhr_importlayer'),
-        url(r'^xhr_updatelayer/$', 'xhr_updatelayer', name='xhr_updatelayer'),
+
+        url(r'^xhr_layer/(?P<layerversion_id>\d+)$',
+            api.XhrLayer.as_view(),
+            name='xhr_layer'),
 
         # JS Unit tests
         url(r'^js-unit-tests/$', 'jsunittests', name='js-unit-tests'),