gvfs freeze break request

[Alexander Larsson <alexl redhat com>]

Request to commit the fix in:
http://bugzilla.gnome.org/show_bug.cgi?id=520851

Essentially its a fix so that the recently changed behaviour wrt what
mounts/mountpoints to display so that it actually works as expected.

The expected behaviour is:
Display all partitions that are not mentioned in fstab or are mounted
inside /media.