update requirements for neutron-lib 1.18.0

Neutron-lib 1.18.0 is our Rocky RC and is already being used by neutron
[1]. This patch updates the neutron-lib required version to match
neutron [1] in prep for the Rocky release.

It also updates the project zuul jobs to pull in openstack/neutron from
git for the lower constraints job (see failure in PS1).

[1] https://review.openstack.org/#/c/583671/

Change-Id: Ieed673b74d8fef81db57e9e4c26f85207b39e6d6

lower-constraints.txt

@@ -52,7 +52,7 @@ msgpack-python==0.4.0
 munch==2.1.0
 netaddr==0.7.18
 netifaces==0.10.4
-neutron-lib==1.14.0
+neutron-lib==1.18.0
 neutron==12.0.0
 openstackdocstheme==1.18.1
 openstacksdk==0.11.2

requirements.txt

@@ -6,7 +6,7 @@ pbr!=2.1.0,>=2.0.0 # Apache-2.0
 eventlet!=0.18.3,!=0.20.1,>=0.18.2 # MIT
 requests>=2.14.2 # Apache-2.0
 netaddr>=0.7.18 # BSD
-neutron-lib>=1.14.0 # Apache-2.0
+neutron-lib>=1.18.0 # Apache-2.0
 neutron>=12.0.0 # Apache-2.0
 SQLAlchemy!=1.1.5,!=1.1.6,!=1.1.7,!=1.1.8,>=1.0.10 # MIT
 alembic>=0.8.10 # MIT

zuul.d/jobs.yaml

@@ -161,3 +161,9 @@
       devstack_plugins:
         octavia: https://github.com/openstack/octavia.git
         neutron-lbaas: https://github.com/openstack/neutron-lbaas.git
+
+- job:
+    name: lbaas-tox-lower-constraints
+    parent: openstack-tox-lower-constraints
+    required-projects:
+      - openstack/neutron

zuul.d/projects.yaml

@@ -1,7 +1,7 @@
 - project:
     check:
       jobs:
-        - openstack-tox-lower-constraints
+        - lbaas-tox-lower-constraints
         - neutron-lbaasv2-dsvm-api
         - neutron-lbaasv2-dsvm-py3x-api:
             branches: ^(?!stable/ocata).*$
@@ -19,7 +19,7 @@
     gate:
       queue: neutron-lbaas
       jobs:
-        - openstack-tox-lower-constraints
+        - lbaas-tox-lower-constraints
         - neutron-lbaasv2-dsvm-api
         - neutron-lbaasv2-dsvm-py3x-api:
             branches: ^(?!stable/ocata).*$