Major improvement in OSM charms

- Adapt all new operator charms to use the same pattern. They are all
using now this library that encapsulates the common logic for all
charms: https://github.com/davigar15/ops-lib-charmed-osm. That will be
eventually moved to gitlab, when it has a PyPI repository available
- Add unit tests to all charms
- Modify installer and bundles to point to the new charms
- Improve the build.sh script for building the charms

Change-Id: I0896ceb082d1b6a76b3560c07482a4135a220a3f
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/installers/charm/pla/config.yaml b/installers/charm/pla/config.yaml
index 57c5df0..ae90304 100644
--- a/installers/charm/pla/config.yaml
+++ b/installers/charm/pla/config.yaml
@@ -16,31 +16,11 @@
 # limitations under the License.
 
 options:
-  image:
-    description: Docker image name
-    type: string
-    default: opensourcemano/pla:latest
-  image_username:
-    description: Docker repository username
-    type: string
-    default: ""
-  image_password:
-    description: Docker repository password
-    type: string
-    default: ""
-  port:
-    description: Port number
-    type: int
-    default: 8080 # Fake port
   log_level:
     description: Log level
     type: string
     default: INFO
-  database:
-    description: Database name
-    type: string
-    default: pla
-  database_common_key:
+  database_commonkey:
     description: Common Key for Mongo database
     type: string
     default: osm