Release Neutron for stable/zed

This release picks up latest backports before transition to Unmaintained

% git log --oneline --no-merges 21.2.0~..a418da89c11d9f1a15c7880c443c84a2afed84d7
4fc3c71546 Fix KeyError failure in _sync_subnet_dhcp_options()
de9e3e8c9b Fix TestOVNMechanismDriver ipv6 tests
ca25eb96f1 Enhance IptablesFirewallDriver with remote address groups
386ebde547 Use the system-dependent string for IP protocol 4
29d28152ac Remove duplicate rows in MySQL query output
38ac22354d fix netns deletion of broken namespaces
cf21a4d979 [OVN] Set MTU of the VETH interfaces between OVS and metadata
7c7b020abe Fix iptables mapping of 'ipip' protocol
d253552ad2 [stable-only][OVN] Set VETH interface MAC address before up
b7e219391d Stable-Only: Temporary stop running grenade jobs on Zed
aedb872e4f Ensure that haproxy spawned by the metadata agents is active
85debddc1c Remove TripleO jobs
32d7efbfb0 Retry ``set|get_link_attribute(s)`` if the interface is not present
b9e3818b6e [OVN] Add ``subnetpool-prefix-ops`` extension to ML2/OVN mech driver
1f5ce18a14 [OVN][FT] Retry in case of timeout when executing "ovsdb-client".
c47c600b6a [Fullstack] Consolidate segmentation_id update tests into single test
5250b62a85 [Fullstack] Remove SecurityGroupRulesTest.test_normalized_cidr_in_rule test
af83df07f4 [Fullstack] Remove test_port_shut_down module
69bda7333f [Fullstack] Remove unnecessary tests
2de488ab11 Set trunk parent port as access port in ovs to avoid loop
0396b33bc4 Revert "Add sleep before checking if ovs port is in the namespace"
905e2e430a Forbid the subnet gateway IP deletion if a router interface is attached
8f15164068 Register Chassis_Private table in BaseOvnSbIdl
222c997022 Add sleep before checking if ovs port is in the namespace
2c8076dd28 Add max limit to agent_down_time
5dcad1d7c7 Don't set port capabilities for OVS HW offloading
bbe235779b Improve the SG RPC callback ``security_group_info_for_ports``
602bb1a325 [OVN][FT] Make explicit the "publish" call check in "test_port_forwarding"
4eb234a447 [OVN] DB sync host/physnet - filter on agent_type
4698dd899f Metadata: handle process exceptions
74a3262a8a Correctly validate subnet arguments when using a subnetpool
de5b7244ee [Fullstack] Double check that agent is dead when it should be dead
69e0dacd05 [DHCP agent] Fetch OVN Metadata port from plugin
9d22276013 get_hosts_mapped_with_segments add filter agt_type
cbebc3dd8a [DHCP agent] Fix route to OVN metadata port for non-isolated networks
b2100c6a29 docs: update default value of metadata workers for ml2/ovn
61ad633a33 Catch non-existent entry failures better in ip_lib
15d5db0d6e Ensure ovn loadbalancer FIPs are centralized upon neutron restarts

Change-Id: Icf56f158ed9ca27aabeff5d0b65bb033e13dada1

deliverables/zed/neutron.yaml

@@ -44,6 +44,10 @@ releases:
     projects:
       - repo: openstack/neutron
         hash: 3ab7d6e6b3c7328ce860144efba3f85b5538eb86
+  - version: 21.2.1
+    projects:
+      - repo: openstack/neutron
+        hash: a418da89c11d9f1a15c7880c443c84a2afed84d7
 branches:
   - name: stable/zed
     location: 21.0.0.0rc1