always default to floating ips for validation

fixed ips are not cross host accessible in our current config. So
always configure tempest to use floating ips.

Change-Id: I1cf605229070024c9d5d29c7a08967aa505fda7b

Author: sdague

lib/tempest

@@ -127,7 +127,7 @@ function configure_tempest {
     local flavor_lines
     local public_network_id
     local public_router_id
-    local ssh_connect_method="fixed"
+    local ssh_connect_method="floating"
 
     # Save IFS
     ifs=$IFS
@@ -236,10 +236,6 @@ function configure_tempest {
         fi
     fi
 
-    if ! is_service_enabled n-net; then
-        ssh_connect_method="floating"
-    fi
-
     ssh_connect_method=${TEMPEST_SSH_CONNECT_METHOD:-$ssh_connect_method}
 
     if [ "$Q_L3_ENABLED" = "True" ]; then