Use default control_path in ansible.cfg

This defaults to a hashed string of the hostname, port and username. The
hash mitigates a common problem users found with long hostames and the
conventional %(directory)s/ansible-ssh-%%h-%%p-%%r format. In those
cases, a "too long for Unix domain socket" ssh error would occur.

Author: oxyc

provisioning/ansible.cfg

@@ -3,4 +3,3 @@ roles_path = ./roles
 
 [ssh_connection]
 pipelining = True
-control_path = /tmp/ansible-ssh-%%h-%%p-%%r