fixes #1765 - changing a conflicting IP address might lead to losing DNS or DHCP records

code comments typos

ensure that autosign entries are removed when using ssh based provisioning.

this is required, as we changed the ssh part to be post db commit.

configTemplate returns nil if a template is not found

Since ssh script now runs post commit, we can not update any attributes within the save method

moved ssh provisioning to post transaction queue

[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

fixes incorrect DNS conflict detection

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)...

fixes #137 - Better support for non-hostname certnames

This patch introduce a new setting :use_uuid_for_certificates which
defaults to false.

users who wish to deploy their hosts using a random unique id, should
enable that setting, and use the certname directive in their puppet.conf...