clean-up-output-of-solum-app-show

Current output of 'solum app show <app-name>' shows the following:

vagrant@devstack:/opt/stack/solum$ solum app show app1
+--------------+---------------------------------------------------------------------+
| Property | Value |
+--------------+---------------------------------------------------------------------+
| app_url | 172.24.4.5:80 |
| entry_points | |
| description | default app description. |
| created_at | 2016-02-15T16:10:47 |
| languagepack | python |
| ports | [80] |
| source | {u'repository': u'https://github.com/rackspace-solum-samples/solum- |
| | python-sample-app.git', u'revision': u'master'} |
| trigger | [u'build', u'deploy'] |
| trigger_uuid | 3111cbf2-ceff-4988-9da0-7b3a71722c9f |
| id | 87291ded-f4df-430c-9852-bd155ddc9e9a |
| name | app1 |
+--------------+---------------------------------------------------------------------+

Following attributes might be confusing to users: entry_points, trigger_uuid, trigger.

We should rename trigger to trigger_actions.

For entry_points and trigger_uuid, we should clarify what they mean, possibly removing them from the output if they are not being used.