Add ansible launch server

As part of the Zuulv2.5 effort, this service is not designed to be
long-lived.

Change-Id: Idbac79f60cb694a9a707d204cd274328289bc20d
diff --git a/setup.cfg b/setup.cfg
index 620e1ac..7ddeb84 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -25,6 +25,7 @@
     zuul-merger = zuul.cmd.merger:main
     zuul = zuul.cmd.client:main
     zuul-cloner = zuul.cmd.cloner:main
+    zuul-launcher = zuul.cmd.launcher:main
 
 [build_sphinx]
 source-dir = doc/source