backend change for #476.

Service monitor should retry if the db backend is still starting up.
create cert during buildout

Fixes #485. (changes for dev)
Create cert as part of initrock

Fixes #485. (changes for prod)
remove cert and key files from git.

Fixes #485.
If rockstor.key or rockstor.cert do not exist, regenerate them.

Fixes #485
Merge pull request #487 from schakrava/issue#485_self_signed_cert

Issue#485 self signed cert