CBQE-0: modified testcfg/kv/testcfg_win.py to have COUCHBASE_SSH_USER and COUCHBASE_SSH_PASSWORD

Change-Id: If2561258aac428e26267a35e152d002d5b3d978b
Reviewed-on: http://review.couchbase.org/41644
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>