bug 1885 - allow sasl plain usr/pwd from ENV
bug 1885 - allow sasl plain usr/pwd from ENV

Change-Id: I9e2023d8e4453424475ba683c18cac05de13344a
Reviewed-on: http://review.northscale.com/1606
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

zbase/moxi,steveyen/moxi,couchbase/moxi,couchbase/moxi,couchbase/moxi,zbase/moxi,membase/moxi,couchbase/moxi,steveyen/moxi,zbase/moxi,membase/moxi,membase/moxi,couchbase/moxi,membase/moxi,steveyen/moxi,membase/moxi,steveyen/moxi,zbase/moxi,couchbase/moxi,steveyen/moxi,membase/moxi,zbase/moxi