CBQE-983: remote_util for win upgrade

handle situaton when windows_info.txt doesn't exist + add get cpu, disk, ram, hostname info for windows

Change-Id: I529d9c9af62984fd5715d465a7c2ba55379ea505
Reviewed-on: http://review.couchbase.org/24050
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>