Log VM console output in remote_connectivity_check

If remote connectivity check fails because of SSH issue or
becasuse of assertion error, console output from instances used
for test will now be logged as it is useful for debugging such
failed tests.

It is similar to what was already done in check_connectivity() method.

Change-Id: I0fb95efd09881492b8e39d5e114b42c1bd944e57
1 file changed