[EC2] Adds retry on host not available, add some useful debugging.

- debugging, to get the whole message
- add backtrace to compute resource failure msg
- add debug logging for Fog errors on create

adds ec2 provisioning support fixes #1223

- added progress bar for instance creation
- minor fixes for certname based deployments
- added ssh provisioning support to orchestartion, which utilize finish
scripts by default
- added images support (part of the vm compute tab)...