Typos in 'agent-class' key in a SCF can prevent all agents relying on agent-class matching to not start-up

Just ran into this problem at Penn. There was a subtle typo in the configuration of a new Agent, 'agent-class' was typo'd to 'agent_class'.

The agent-class matching loops over all agent blocks in the SCF and will hit a KeyError when it can't find the 'agent-class' key.

https://github.com/simonsobs/ocs/blob/076105e9613ef78745d37df3d9bf8a38ce1e28bd/ocs/site_config.py#L491-L501

Here's an abbreviated log with a print(dev) before line 495 (where I've just trimmed other valid agent configs):

2022-06-22T23:14:54+0000 {'agent-class': 'CrateAgent', 'instance-id': 'crate1-monitor', 'manage': 'docker', 'arguments': [['--shm-addr', 'root@192.168.1.2'], ['--crate-id', 'crate1']]}
2022-06-22T23:14:54+0000 {'agent-class': 'DLMAgent', 'instance-id': 'dlm', 'manage': 'docker', 'arguments': [['--ip-address', '10.10.10.21'], ['--port', '9221']]}
2022-06-22T23:14:54+0000 {'agent_class': 'starcam_Agent', 'instance-id': 'starcam', 'manage': 'docker', 'arguments': [['--ip-address', '10.10.10.167'], ['--user-port', '8000']]}
2022-06-22T23:14:54+0000 Traceback (most recent call last):
2022-06-22T23:14:54+0000   File "influxdb_publisher.py", line 160, in <module>
2022-06-22T23:14:54+0000     args = site_config.parse_args(agent_class='InfluxDBAgent', parser=parser)
2022-06-22T23:14:54+0000   File "/usr/local/lib/python3.8/dist-packages/ocs/site_config.py", line 718, in parse_args
2022-06-22T23:14:54+0000     site, host, instance = get_config(pre_args, agent_class=agent_class)
2022-06-22T23:14:54+0000   File "/usr/local/lib/python3.8/dist-packages/ocs/site_config.py", line 496, in get_config
2022-06-22T23:14:54+0000     if dev['agent-class'] == agent_class:
2022-06-22T23:14:54+0000 KeyError: 'agent-class'

The side-effect is any Agent relying on this matching to know it's config will not start-up.

Start in ocs/site_config.py at the agent-class matching loop around lines 491-501, tracing how get_config is called by parse_args. Reproduce the failure with an agent block using agent_class, then verify that an incorrectly keyed block no longer prevents other agents from starting.