Don't emit net-info macro

We do this in the zuul v3 base job now, so we don't need to
paste it into all of the new jobs.

Change-Id: I053af44e7bd22bb2a35d438819c75850d2b93087
diff --git a/zuul/cmd/migrate.py b/zuul/cmd/migrate.py
index 66c32a4..185ccb1 100644
--- a/zuul/cmd/migrate.py
+++ b/zuul/cmd/migrate.py
@@ -707,6 +707,9 @@
             return
         if 'echo "Detailed logs:' in builder['shell']:
             return
+        if ('cat /etc/dib-builddate.txt' in builder['shell'] and
+                'echo "Network configuration data..."' in builder['shell']):
+            return
 
         task = self._emitShellTask(builder['shell'], syntax_check)
         if not task: