Add a partition warning for LVM2 PVs which can't be resized (#670171)

As LVM2 Physical Volumes can't be resized when they are members of
exported Volume Groups add a warning message to explain this fact.
Display the message as a partition specific warning and as additional
text when growing the file system to fill the partition is skipped for
the check operation and when pasting into an existing larger partition.

Bug #670171 - Add LVM PV read-write support