And finally some more restructuring work :)

- move the filesystem options into an Object
  + eliminate a method in the Globals singleton that is FS independent,
    confusing and returns data structure that gets indexed, making data
    access error prone
  + first step to moving filesystem options into XML and unifying it
    with existing ZFS setting in the XML
  + we should not have disconnected ways of dealing with filesystem options
  + this will help with the implementation of *Builder classes for the
    various filesystems
- fix type in the command line test trigger
- fix inconsistency when applying tune options for ext file systems for the
  root file system
  + previously it was possible that both user specified tune options and
    built in kiwi option were passed to tune2fs. The tune2fs manpage does
    not specify the behavior when the same option is specified twice