Update IRC references

Change-Id: I84619f8ebb0e5fe0461155544b72167f18365f9f

README.rst

@@ -67,7 +67,7 @@ computing, and encourages you to join the `Open Infrastructure Foundation
 The best way to get involved with the community is to talk with others
 online or at a meet up and offer contributions through our processes,
 the `OpenStack wiki <https://wiki.openstack.org>`_, blogs, or on IRC at
-``#openstack`` on ``irc.freenode.net``.
+``#openstack`` on ``irc.oftc.net``.
 
 We welcome all types of contributions, from blueprint designs to
 documentation to testing to deployment scripts.

doc/upstream-training/source/website/upstream-trainees-guide.rst

@@ -50,4 +50,4 @@ How to prepare
 .. note::
    If you are attempting the steps above before the Upstream Institute class
    and need assistance you can find mentors in the #openstack-upstream-institute
-   channel on irc.freenode.net.
+   channel on irc.oftc.net.