Switch the default Neutron ML2 driver to OVN

This patch is changing the default driver used in Packstack from
ML2/OVS to ML2/OVN. It also flips jobs running with OVS to OVN and
viceversa while keeping the lbaas scenario with OVS.

Also, the encapsulation used by default changes from vxlan to
geneve.

Change-Id: I0abfdb1de66730101a27ca3a949f056b50fc9c98
Signed-off-by: Daniel Alvarez <dalvarez@redhat.com>

README.md

@@ -178,7 +178,7 @@ the current matrix of available tests:
 | glance         |             |    file     |    swift    |     file    |
 | nova           |      X      |      X      |      X      |      X      |
 | neutron        |      X      |      X      |      X      |      X      |
-| neutron plugin |     ovs     |     ovn     |     ovs     |     ovs     |
+| neutron plugin |     ovn     |     ovn     |     ovs     |     ovn     |
 | lbaasv2        |             |             |      X      |             |
 | vpnaas         |             |             |             |             |
 | cinder         |      X      |      X      |             |             |

packstack/plugins/neutron_350.py

@@ -343,7 +343,7 @@ def initConfig(controller):
                         "entrypoints"),
              "OPTION_LIST": ["local", "flat", "vlan", "gre", "vxlan", "geneve"],
              "VALIDATORS": [validators.validate_multi_options],
-             "DEFAULT_VALUE": "vxlan,flat",
+             "DEFAULT_VALUE": "geneve,flat",
              "MASK_INPUT": False,
              "LOOSE_VALIDATION": False,
              "USE_DEFAULT": False,
@@ -356,7 +356,7 @@ def initConfig(controller):
                         "network_types to allocate as tenant networks"),
              "OPTION_LIST": ["local", "vlan", "gre", "vxlan", "geneve"],
              "VALIDATORS": [validators.validate_multi_options],
-             "DEFAULT_VALUE": "vxlan",
+             "DEFAULT_VALUE": "geneve",
              "MASK_INPUT": False,
              "LOOSE_VALIDATION": False,
              "USE_DEFAULT": False,
@@ -371,7 +371,7 @@ def initConfig(controller):
                              "hyperv", "ncs", "arista", "cisco_nexus",
                              "mlnx", "l2population", "sriovnicswitch", "ovn"],
              "VALIDATORS": [validators.validate_multi_options],
-             "DEFAULT_VALUE": "openvswitch",
+             "DEFAULT_VALUE": "ovn",
              "MASK_INPUT": False,
              "LOOSE_VALIDATION": False,
              "USE_DEFAULT": False,
@@ -450,7 +450,7 @@ def initConfig(controller):
                         "with Neutron"),
              "OPTION_LIST": ["linuxbridge", "openvswitch", "ovn"],
              "VALIDATORS": [validators.validate_options],
-             "DEFAULT_VALUE": "openvswitch",
+             "DEFAULT_VALUE": "ovn",
              "MASK_INPUT": False,
              "LOOSE_VALIDATION": False,
              "CONF_NAME": "CONFIG_NEUTRON_L2_AGENT",
@@ -588,6 +588,10 @@ def initSequences(controller):
         ovs_external = 'CONFIG_NEUTRON_OVS_EXTERNAL_PHYSNET'
         ovn_external = 'CONFIG_NEUTRON_OVN_EXTERNAL_PHYSNET'
         config[ovs_external] = config[ovn_external]
+    elif use_ml2_with_ovs(config):
+        if ('openvswitch' not in config[
+                'CONFIG_NEUTRON_ML2_MECHANISM_DRIVERS']):
+            config['CONFIG_NEUTRON_ML2_MECHANISM_DRIVERS'] = 'openvswitch'
 
     plugin_db = 'neutron'
     plugin_path = 'neutron.plugins.ml2.plugin.Ml2Plugin'

releasenotes/notes/switch-default-neutron-driver-to-ovn-0eb7053b81c7794d.yaml

@@ -0,0 +1,11 @@
+---
+prelude: >
+    The default ML2 driver is replaced from ``openvswitch``to ``ovn``. This
+    means that, when deploying packstack with the default settings, OVN will
+    be used as the networking backend for Neutron.
+features:
+  - |
+    OVN is now used as the default networking backend for Neutron when
+    deploying packstack. Neutron agents such as L2, L3 or DHCP agents are no
+    longer used and get replaced by OVN services.
+    The encapsulation used will be ``geneve`` instead of ``vxlan``.

tests/scenario001.sh

@@ -36,9 +36,6 @@ $SUDO packstack ${ADDITIONAL_ARGS} \
           --os-horizon-ssl=y \
           --amqp-enable-ssl=y \
           --glance-backend=file \
-          --os-neutron-l2-agent=ovn \
-          --os-neutron-ml2-type-drivers="geneve,flat" \
-          --os-neutron-ml2-tenant-network-types="geneve" \
           --provision-uec-kernel-url="/tmp/cirros/cirros-$CIRROS_VERSION-$CIRROS_ARCH-vmlinuz" \
           --provision-uec-ramdisk-url="/tmp/cirros/cirros-$CIRROS_VERSION-$CIRROS_ARCH-initrd" \
           --provision-uec-disk-url="/tmp/cirros/cirros-$CIRROS_VERSION-$CIRROS_ARCH-disk.img" \

tests/scenario002.sh

@@ -36,6 +36,9 @@ $SUDO packstack ${ADDITIONAL_ARGS} \
           --os-cinder-install=n \
           --os-horizon-install=n \
           --glance-backend=swift \
+          --os-neutron-l2-agent=openvswitch \
+          --os-neutron-ml2-type-drivers="vxlan,flat" \
+          --os-neutron-ml2-tenant-network-types="vxlan" \
           --os-neutron-lbaas-install=y \
           --os-neutron-vpnaas-install=n \
           --os-sahara-install=y \