Remove #llvm buildbot as it doesn't scale to the size of the project anymore

[dblaikie]

Summary

Broadcasting all breakage to all IRC users isn't effective - more
buildbots, more failure modes, means that there's almost always some
noise & a single breakage can result in many redundant mails from
distinct buildbots, making the channel difficult to use.

[MaskRay]

LGTM

[thakis]

Thanks!

[gkistanova]

LGTM

buildbot/osuosl/master/config/status.py

return [
             fromaddr = "[e-mail]",
             extraRecipients = [default_email],
             lookup = ConfigEmailLookup(os.path.join(os.path.dirname(__file__),
                                                     "llvmauthors.cfg"),
                                        default_email),
             mode = "problem",
             builders = standard_builders),
         buildbot.status.words.IRC(
-            host = "irc.oftc.net", nick = "llvmbb",
-            channels = ["#llvm"],
-            allowForce = True,
-            categories = standard_categories,
-            notify_events = ['successToFailure', 'failureToSuccess']),
-        # Use different nick's in the different channels to support ignoring
-        # one bot or the other.
-        # (Note: /ignore applies to all channels on the network)
-        buildbot.status.words.IRC(
             host = "irc.oftc.net", nick = "llvmbb-llvm-build",
             channels = ["#llvm-build"],
             allowForce = True,
             categories = standard_categories,
             notify_events = ['successToFailure', 'failureToSuccess']),
 
         # In addition to that the following notifiers are defined for special
         # cases.