Summary: Updated sudoers approved commands for cloud user

Detail: Previously the cloud user has full password-less sudo access.
This commit changes that to only allow access to a specific list of
commands. Been tested in production on ACS 4.0 and 4.2 mangement servers.

BUG-ID: CLOUDSTACK-967
Bugfix-for:
Reviewed-by:
Reported-by:
Signed-off-by: John Kinsella <jlk@stratosec.co> 1382560936 -0700
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/cloudstack