CI: Bump instance creation timeout to 5 minutes

In many cases we've seen that current 120 seconds is not enough
Signed-Off-By: Michal Nasiadka <mnasiadka@gmail.com>
Change-Id: Iaf863f4e0aaeefd1270030e1b456aa5b258fe5a7

tests/test-core-openstack.sh

@@ -262,7 +262,7 @@ function test_ssh {
     local instance_name=$1
     local fip_addr=$2
     local attempts
-    attempts=12
+    attempts=30
     for i in $(seq 1 ${attempts}); do
         if ping -c1 -W1 ${fip_addr} && ssh -v -o BatchMode=yes -o StrictHostKeyChecking=no cirros@${fip_addr} hostname; then
             break