Merge pull request #64 from gecos-team/sssd

SSSD resource and provisioner
Merge pull request #65 from gecos-team/sssd

SSSD: Clean variables
Added modify action to localuser json schema
update version of metadata
Recipe: Change desktop background to all users
Merge pull request #66 from gecos-team/desktop_background

Recipe: Change desktop background to all users
Recipe: Change verification of main variable
Merge pull request #67 from gecos-team/desktop_background

Recipe: Change verification of main variable
Removed utf8 character