fix sftp_umask; store as literal not octal

Numbers with leading zeros need to be quoted in Ansible, otherwise they
are interpreted as octal. Which the templating happily writes out in...
decimal.

In this case, sftp_umask 0027 was ending up as 23 in sshd.conf.

Signed-off-by: Alex Waite <alex@waite.eu>

Author: aqw

Diff for: README.md

@@ -47,7 +47,7 @@ Warning: This role disables root-login on the target server! Please make sure yo
 |`ssh_print_motd` | false | false to disable printing of the MOTD|
 |`ssh_print_last_log` | false | false to disable display of last login information|
 |`sftp_enabled` | false | true to enable sftp configuration|
-|`sftp_umask` | 0027 | Specifies the umask for sftp|
+|`sftp_umask` | '0027' | Specifies the umask for sftp|
 |`sftp_chroot` | true | false to disable chroot for sftp|
 |`sftp_chroot_dir` | /home/%u | change default sftp chroot location|
 |`ssh_client_roaming` | false | enable experimental client roaming|

Diff for: defaults/main.yml

@@ -153,7 +153,7 @@ sftp_enabled: false
 sftp_chroot: true
 
 # sftp default umask
-sftp_umask: 0027
+sftp_umask: '0027'
 
 # change default sftp chroot location
 sftp_chroot_dir: /home/%u