Change nova doc after Freenode -> OFTC move

Change-Id: I65e5ac1709d1ddbbf7a1d6b27070e676dedea186

Author: Balazs Gibizer

doc/source/contributor/api.rst

@@ -231,7 +231,7 @@ The functional API samples tests are not the simplest thing in the world to
 get used to, and can be very frustrating at times when they fail in not
 obvious ways. If you need help debugging a functional API sample test failure,
 feel free to post your work-in-progress change for review and ask for help in
-the ``openstack-nova`` freenode IRC channel.
+the ``openstack-nova`` OFTC IRC channel.
 
 
 Documentation

releasenotes/notes/deprecate-image-download-ext-point-cd5809e11bbd09d3.yaml

@@ -8,5 +8,5 @@ deprecations:
     ``nova.image.download.modules`` extension point is not maintained
     and there is no indication of its use in production clouds. If you are
     using this extension point, please make the nova development team
-    aware by contacting us in the #openstack-nova freenode IRC channel or
+    aware by contacting us in the #openstack-nova OFTC IRC channel or
     on the openstack-dev mailing list.

releasenotes/notes/deprecate-xen-driver-train-bd57a16fa51ab679.yaml

@@ -4,5 +4,5 @@ deprecations:
     The xenapi driver is deprecated and may be removed in a future release.
     The driver is not tested by the OpenStack project nor does it have clear
     maintainer(s) and thus its quality can not be ensured. If you are using
-    the driver in production please let us know in freenode IRC and/or the
+    the driver in production please let us know in OFTC IRC and/or the
     openstack-discuss mailing list.

releasenotes/notes/remove-caching-scheduler-cfe0985b5a58bef4.yaml

@@ -42,5 +42,5 @@ upgrade:
     If you rely on the ``caching_scheduler`` driver or your own out-of-tree
     driver which sets ``USES_ALLOCATION_CANDIDATES = False`` to bypass the
     placement service, please communicate with the nova development team in
-    the openstack-dev mailing list and/or #openstack-nova freenode IRC channel
-    to determine what prevents you from using the ``filter_scheduler`` driver.
+    the openstack-dev mailing list and/or #openstack-nova OFTC IRC channel
+    to determine what prevents you from using the ``filter_scheduler`` driver.