Move pipelining option to ansible.cfg

ansible.cfg

@@ -1,2 +1,3 @@
 [defaults]
 retry_files_enabled = False
+pipelining = True

examples/hosts

@@ -11,4 +11,4 @@
 # consider adding an additional `ansible_connection=local` argument below.
 
 [matrix_servers]
-matrix.<your-domain> ansible_host=<your-server's external IP address> ansible_ssh_user=root ansible_ssh_pipelining=yes
+matrix.<your-domain> ansible_host=<your-server's external IP address> ansible_ssh_user=root