In the Libvirt inspector we call the interfaceStats()
function but there is a race between us checking if
the domain is stopped and calling interfaceStats.
This adds a try-catch around interfaceStats the
same way as is already done for blockStats etc.
Closes-Bug: #2113768
Change-Id: I25ba64f5eefe8140b45bc4ff7e20c323dc5efd79
(cherry picked from commit 70a56ba670)
Signed-off-by: Tobias Urdin <tobias.urdin@binero.com>