CBQE-847:Windows support for warmup test cases

warmup job requires os identification and windows taskkill command to run over windows vm
to kill and restart

Change-Id: Ie317e654a9345075978e88bb2a87baf5877e1985
Reviewed-on: http://review.couchbase.org/23901
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Deepkaran Salooja <deepkaran.salooja@globallogic.com>
MB-5707 Test reproducer for the bug

Change-Id: I23f8d0c9abd1a728436d7982949acbb60810c8d6
Reviewed-on: http://review.couchbase.org/21420
Reviewed-by: Deepkaran Salooja <deepkaran.salooja@globallogic.com>
Tested-by: Deepkaran Salooja <deepkaran.salooja@globallogic.com>