Fix style

* fix indentation
* remove trailing space
Determine file system and allow not managing NFS home directories

* add 'manage_nfs_home_dirs' attribute for manage resource
* determine FS type before managing it
* manage all FS types by default to keep previous behaviour
* add tests
Merge pull request #42 from iroller/COOK-4404

[COOK-4404] Determine file system and allow not managing NFS home directories