LVM: Robustify skipactivation detection

Running lvchange might fail due to not being in
$PATH for non-root user, and the corresponding OSError
was not caught.

Simply check for lvm2 being 2.02.99 or newer.

Closes-Bug: #1269445
Change-Id: I308bd97cb729e83677f18a693274265a182d794c
Merge "LVM: Robustify skipactivation detection"