Validate creedentials are correct before attempting to bootstrap a joyent environment
Merge pull request #1066 from wallyworld/validate-joyent-credentials

Validate creedentials are correct before attempting to bootstrap a joyent environment

Partially fixes: https://bugs.launchpad.net/bugs/1362072

In a similar vein to what was done for ec2 etc, validate joyent credentials prior to bootstrapping.

Tested live.