[KNIFE-480] added support for user data
requiring at least fog 1.22 in order to support user data functionality
Merge pull request #80 from rackspace/KNIFE-480

KNIFE-480 Add user data support for config drive
KNIFE-480 changed --rackspace-user-data to file instead of string on the command line to be consistent with the nova cli
Merge pull request #81 from rackspace/KNIFE-480-2

KNIFE-480 Updating user data to use file
--secret-file support for bootstrap
Merge branch 'master' of https://github.com/popsikle/knife-rackspace