Pre-allocate func test vip ports

Resolves: #269

openstack/tools/charmed_openstack_functest_runner.sh

@@ -133,14 +133,20 @@ FIP_MIN_ABC=${FIP_MIN%.*}
 FIP_MIN_D=${FIP_MIN##*.}
 FIP_MIN=${FIP_MIN_ABC}.$(($FIP_MIN_D + 64))
 
-CIDR_OAM=$(openstack subnet show subnet_${OS_USERNAME}-psd -c cidr -f value)
-OAM_MAX=$(ipcalc $CIDR_OAM| awk '$1=="HostMax:" {print $2}')
-OAM_MIN=$(ipcalc $CIDR_OAM| awk '$1=="HostMin:" {print $2}')
-OAM_MIN_ABC=${OAM_MIN%.*}
-OAM_MAX_D=${OAM_MAX##*.}
-# Picking last two addresses and hoping they dont get used by Neutron.
-export {OS,TEST}_VIP00=${OAM_MIN_ABC}.$(($OAM_MAX_D - 1))
-export {OS,TEST}_VIP01=${OAM_MIN_ABC}.$(($OAM_MAX_D - 2))
+# Setup VIPs
+NUM_VIPS=2
+for ((i=$NUM_VIPS;i;i-=1)); do
+    # We use the same naming convention as ../tools/allocate_vips.sh to avoid conflicts and re-use
+    # those vips.
+    vip_port_name=ps6-vip-ip$((i-1))
+    vip_addr=$(openstack port show -c fixed_ips $vip_port_name -f yaml| yq .fixed_ips[0].ip_address)
+    if [[ $vip_addr = null ]]; then
+        # Pre-allocate ports with addresses used for VIPs so that they don't
+        # collide with the deployment itself.
+        allocate_port net_${OS_USERNAME}-psd $vip_port_name
+    fi
+    export {OS,TEST}_VIP0$((i-1))=$vip_addr
+done
 
 # More information on config https://github.com/openstack-charmers/zaza/blob/master/doc/source/runningcharmtests.rst
 export {,TEST_}NET_ID=$(openstack network show net_${OS_USERNAME}-psd-extra -f value -c id)

openstack/tools/func_test_tools/common.sh

@@ -43,4 +43,11 @@ apply_func_test_pr ()
         -f './test-requirements*.txt' \
         -f './src/test-requirements*.txt' \
         "$msg"
-}
+}
+
+allocate_port ()
+{
+    local net_name=$1
+    local port_name=$2
+    openstack port create --network $net_name $port_name
+}