Support --no-authentication in bbctl client

[TheTechromancer]

$ bbctl asset list
[INFO] Loading config files from: /home/bls/Downloads/code/bbot-server/bbot_server/defaults.yml, /home/bls/.config/bbot_server/config.yml
[INFO] Loading config files from: /home/bls/Downloads/code/bbot-server/bbot_server/defaults.yml, /home/bls/.config/bbot_server/config.yml
[ERROR] No API keys found in the config. Please set `api_keys` in your config file or run `bbctl server apikey add`

[TheTechromancer]

Adding an API key doesn't work:

bls bbot-server $ bbctl server apikey add
[INFO] Loading config files from: /home/bls/Downloads/code/bbot-server/bbot_server/defaults.yml, /home/bls/.config/bbot_server/config.yml
[INFO] Adding new API key
[INFO] Writing 1 API keys to config file at /home/bls/.config/bbot_server/config.yml
[INFO] New API key added:
[INFO]     - API KEY: deadbeef-9e80-4ff5-897d-3e6d8b383f05
bls bbot-server $ bbctl asset list
[INFO] Loading config files from: /home/bls/Downloads/code/bbot-server/bbot_server/defaults.yml, /home/bls/.config/bbot_server/config.yml
[INFO] Loading config files from: /home/bls/Downloads/code/bbot-server/bbot_server/defaults.yml, /home/bls/.config/bbot_server/config.yml
[ERROR] No API keys found in the config. Please set `api_keys` in your config file or run `bbctl server apikey add`