Fix openSUSE 13.2 integration tests

My test image had the file /var/lib/zypp/AutoInstalled which doesn't
exist in the newly created images anymore.
Merge pull request #400 from SUSE/fix_integration_test

Fix openSUSE 13.2 integration tests
Add special dirs to tar filter list and show warning

Special dirs are now also added to the tar exclude list to prevent
issues when the mount point is below a unmanaged file tree.

Additionally a similar warning as the one for the remote dirs is shown
to the users.

Fixes #384
Filter GVFS fuse file system

Old Gnome versions did created for every user under ~/.gvfs a mount
point to the GVFS fuse file system.
Root couldn't access these so the inspection did fail.

Additionally the find command does give a return code bigger than zero
if it does scan the parent directory.

To prevent the unmanaged-file inspector from failing the
ExecutionFailed statement is catched and a warning is
shown.

I have also added these file systems to the special file system list to
filter it for tar.

An easy way to reproduce the issue is to run
`/usr/lib64/gvfs/gvfs-fuse-daemon /<user-writeable-directory>` as user.
The related package is gvfs-fuse.

Fixes #393