PermitRootLogin can be 'yes', 'no', 'without-password',
'prohibit-password' or 'forced-commands-only'.
This patch changes the functionality to ensure that
security_sshd_permit_root_login is one of the above settings - if so, it
will use that value.
Due to the way Ansible handles "no" and "yes", we have to check if the
value is "False" (string equivalent for boolean no), and if so output
"no", otherwise output the string (which would be one of the above
options).
Previously, we could only set this value to 'no'.
Change-Id: I5ee5ff6abc4578d17d4b23d8a2fa1648508ceeed
f32cb3c081