Acclerate improvements

* Added capability to support multiple keys, so clients from different
  machines can connect to a single daemon instance
* Any activity on the daemon will cause the timeout to extend, so that the
  daemon must be idle for the full number of minutes before it will auto-
  shutdown
* Various other small fixes to remove some redundancy

Fixes #5171

lib/ansible/constants.py

@@ -165,6 +165,7 @@ ACCELERATE_CONNECT_TIMEOUT     = get_config(p, 'accelerate', 'accelerate_connect
 ACCELERATE_KEYS_DIR            = get_config(p, 'accelerate', 'accelerate_keys_dir', 'ACCELERATE_KEYS_DIR', '~/.fireball.keys')
 ACCELERATE_KEYS_DIR_PERMS      = get_config(p, 'accelerate', 'accelerate_keys_dir_perms', 'ACCELERATE_KEYS_DIR_PERMS', '700')
 ACCELERATE_KEYS_FILE_PERMS     = get_config(p, 'accelerate', 'accelerate_keys_file_perms', 'ACCELERATE_KEYS_FILE_PERMS', '600')
+ACCELERATE_MULTI_KEY           = get_config(p, 'accelerate', 'accelerate_multi_key', 'ACCELERATE_MULTI_KEY', False, boolean=True)
 PARAMIKO_PTY                   = get_config(p, 'paramiko_connection', 'pty', 'ANSIBLE_PARAMIKO_PTY', True, boolean=True)
 
 # characters included in auto-generated passwords