opt in for neutron-lib consumption patches

As part of the Denver PTG [1] we decided networking related projects
that are "current" and want to receive neutron-lib consumption patches
on an on-going basis should indicate such with a well defined comment
in their requirements.txt. This allows us to easily find the list of
project to receive neutron-lib consumption patches [2] by searching for
the string.

In addition, projects opting-in for these patches are also attesting
they will stay up to date with TC and infra initiatives to ensure
consumption patches can flow freely.

This patch adds the "neutron-lib-current" string to requirements.txt
opting in for neutron-lib consumption patches.

[1] https://etherpad.openstack.org/p/neutron-stein-ptg
[2] https://docs.openstack.org/neutron-lib/latest/contributor/contributing.html#phase-4-consume

Change-Id: I062c3e980371e03079267147fa21f47c91c34c6f

requirements.txt

@@ -42,3 +42,9 @@ oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0
 oslo.service!=1.28.1,>=1.24.0 # Apache-2.0
 oslo.utils>=3.33.0 # Apache-2.0
 sqlalchemy-migrate>=0.11.0 # Apache-2.0
+
+# The comment below indicates this project repo is current with neutron-lib
+# and should receive neutron-lib consumption patches as they are released
+# in neutron-lib. It also implies the project will stay current with TC
+# and infra initiatives ensuring consumption patches can land.
+# neutron-lib-current