beaglecli crashes immediately if it cannot connect to Beagle

[stevekm]

beaglecli crashes immediately upon starting if it cannot connect to a Beagle instance. This prevents you from seeing the 'help' page with beaglecli -h;

$ beaglecli -h
Traceback (most recent call last):
  File "/home/kellys5/projects/beagle-dev/beagle-dev4/conda/lib/python3.7/site-packages/urllib3/connection.py", line 159, in _new_conn
    (self._dns_host, self.port), self.timeout, **extra_kw)
  File "/home/kellys5/projects/beagle-dev/beagle-dev4/conda/lib/python3.7/site-packages/urllib3/util/connection.py", line 80, in create_connection
    raise err
  File "/home/kellys5/projects/beagle-dev/beagle-dev4/conda/lib/python3.7/site-packages/urllib3/util/connection.py", line 70, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused

During handling of the above exception, another exception occurred:
....
....

It would be more helpful to allow bealgecli to delay trying to establish a connection to a Beagle instance until it actually needs one, so you can at least see the 'help' page in offline mode.