CLOUDSTACK-2513: VPN tests refer to invalid connection.user in cloudConnection

cloudConnection object should always have "user" and "passwd" attributes.
And they are "None" while creating userAPIClient. As we already
have "user" and "password" for mgmt server.

Signed-off-by: Prasanna Santhanam <tsp@apache.org>

tools/marvin/marvin/cloudstackConnection.py

@@ -43,10 +43,8 @@ class cloudConnection(object):
         self.securityKey = securityKey
         self.mgtSvr = mgtSvr
         self.port = port
-        if user:
-            self.user = user
-        if passwd:
-            self.passwd = passwd
+        self.user = user
+        self.passwd = passwd
         self.logging = logging
         self.path = path
         self.retries = 5