udisks2: set should_automount to TRUE for loop devices set up by the user
udisks2: set should_automount to TRUE for loop devices set up by the user

Also set the Autoclear property after successfully mounting/unlocking
devices on a loop device.

Signed-off-by: David Zeuthen <28530fef9e2e0b434a729cd52034a7c3086e28c1@gmail.com>

philipl/gvfs,halfline/gvfs,gicmo/gvfs,gicmo/gvfs,xkahn/gvfs-cmis,philipl/gvfs,halfline/gvfs,xkahn/gvfs-cmis,xkahn/gvfs-cmis,philipl/gvfs,gicmo/gvfs,gicmo/gvfs,halfline/gvfs,xkahn/gvfs-cmis