CBQE-5213 remove extra arg in installation script in mac os

Change-Id: I46e871d34b57f914290b964a6b6809e654899083
Reviewed-on: http://review.couchbase.org/119128
Tested-by: Thuan Nguyen <soccon@gmail.com>
Reviewed-by: Ritesh Agarwal <ritesh.agarwal@couchbase.com>

scripts/install_utils.py

@@ -124,7 +124,7 @@ def pre_install_cb(self):
                 start_time = time.time()
                 while time.time() < start_time + timeout:
                     try:
-                        ret = hdiutil_attach(self.shell, self.build.path, self.build.version)
+                        ret = hdiutil_attach(self.shell, self.build.path)
                         if ret:
                             break
                         self.wait_for_completion(duration, event)