R1:5342bb10734a

Don't fatal on daemon status updates from `phd`

Summary:
See D3126, T1667, T1658. Prior to D3126, `phd` did not use MySQL directly. Now that it does, there are at least two specific problems (see inline comment).

In the long term, we should probably break this dependency and use Conduit. However, we don't currently have access to the daemon log ID and getting it is a mess (the overseer generates it), and I think I want to rewrite how all this works at some point anyway (the daemon calls are currently…