Ansible launcher: include PATH

Change-Id: Ia5becf5d6f494d759ac182e917556c6398961d81
diff --git a/zuul/launcher/ansiblelaunchserver.py b/zuul/launcher/ansiblelaunchserver.py
index 7b0a108..73c208e 100644
--- a/zuul/launcher/ansiblelaunchserver.py
+++ b/zuul/launcher/ansiblelaunchserver.py
@@ -742,6 +742,7 @@
 
         parameters = args.copy()
         parameters['WORKSPACE'] = os.path.join(self.workspace_root, job_name)
+        parameters['PATH'] = '/usr/local/bin:/usr/bin:/bin'
 
         with open(jobdir.inventory, 'w') as inventory:
             for host_name, host_vars in self.getHostList():