Bug 903071: bypass test_ssh_connectivity if ssh key is not uploaded
Don't say anything, since user expressly told us not to upload the key.
Fix up specs.

wizard.rb: rest_client can be nil during the spec run
wizard_spec.rb: set up stubs correctly at various stages of the spec runs so that wizard behaves correctly.
Put code where they belong.
Merge pull request #284 from BanzaiMan/bz903071

Merged by openshift-bot