CBQE-2330 fix install cb server for mac

Change-Id: I2d70929a3e30d19583a2937f8a73ddc60427eeab
Reviewed-on: http://review.couchbase.org/39543
Reviewed-by: Thuan Nguyen <soccon@gmail.com>
Tested-by: Thuan Nguyen <soccon@gmail.com>