Add DEFAULT_TRANSPORT and DEFAULT_TRANSPORT_OPTS constants

DEFAULT_TRANSPORT is set to paramiko.  DEFAULT_TRANSPORT_OPTS is a list
of possible transport options; it is set to local and paramiko.

lib/ansible/constants.py

@@ -33,3 +33,5 @@ DEFAULT_POLL_INTERVAL  = 15
 DEFAULT_REMOTE_USER    = 'root'
 DEFAULT_REMOTE_PASS    = None
 DEFAULT_REMOTE_PORT    = 22
+DEFAULT_TRANSPORT      = 'paramiko'
+DEFAULT_TRANSPORT_OPTS = ['local', 'paramiko']