fix for bug 915571 - blocking haproxy from being added to app
US2448
Added unit tests for alias and domain
Added validation for SSL certificate and private key
Added certificate_added_at to alias
ignore errors in teardown
Merge pull request #1468 from lnader/master

Merged by openshift-bot
Merge pull request #1475 from abhgupta/abhgupta-ssh-keys

Merged by openshift-bot
Adding pages which are used during doc generation.
Merge pull request #1476 from kraman/master

Adding pages which are used during doc generation
Use update rather than find_and_modify