Fix 1473 and add vca_model_config_* to lcm charm

Changes in all operator charms:
- Optimize deps for tox environments
- Add import-order-style to flake8
- Optimize .jujuignore to reduce the size of charm artifacts
OSM LCM charm:
- Added vca_model_config_* options
Added bundle example for using a bundle
Updated the bundles and pin the new versions in the installer

Change-Id: Ic6591354fa5d1b5f43383215b2f0df13eb28ce67
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/installers/charm/ng-ui/requirements-test.txt b/installers/charm/ng-ui/requirements-test.txt
index d7585f3..cf61dd4 100644
--- a/installers/charm/ng-ui/requirements-test.txt
+++ b/installers/charm/ng-ui/requirements-test.txt
@@ -17,15 +17,4 @@
 #
 # To get in touch with the maintainers, please contact:
 # osm-charmers@lists.launchpad.net
-##
--r requirements.txt
-coverage
-stestr
-mock
-black
-yamllint
-flake8
-safety
-requests-mock
-asynctest
-nose2
\ No newline at end of file
+mock==4.0.3