(RE-2150) Add 'support' user to to AIX -support instances

This commit adds a file containing the Support team's ssh public keys.
This will be used to provision ssh-key authentication to the 'support'
account on the AIX "-support" instances that are not Puppet-managed.
Merge pull request #61 from geoffnichols/RE-2150/master/add_authorized_keys_support_team

(RE-2150) Add 'support' user to to AIX -support instances