Currently the mainchaind-checker fires once on init(exiting early), and once every N minutes. When validating peg-ins it will call the mainchaind's RPC looking for non-error responses, as well as the expected parent genesis blockhash.

In the case of a RPC_IN_WARMUP error, we wait 1 second and try the RPC loop again. This should probably only happen on the initial startup check, and instead fail on non-initial checks. Failure here would just mean it will try to succeed again in N minutes anyways.