add more info to startup log and healthz endpoint

[danstoner]

Current startup log looks something like:

$ npm start

> idb-search-api@1.0.5 start /home/dstoner/git/idigbio-search-api
> node index.js

2018-10-26T15:20:36.680Z - info: BEGIN LOGGING - SEVERITY = debug
2018-10-26T15:20:36.682Z - info: Current environment: development
2018-10-26T15:20:37.318Z - info: Using redis server: localhost
2018-10-26T15:20:41.807Z - info: Found updates to lastModified: {"records":"2018-10-13T15:13:05.710Z","mediarecords":"2018-10-13T15:09:10.877Z","recordsets":"2018-10-14T09:25:22.910Z","publishers":"2018-10-12T15:57:20.994Z"}
2018-10-26T15:20:41.808Z - info: updateLastModified durationMs=4464
2018-10-26T15:20:41.904Z - info: App warmup finished
2018-10-26T15:20:41.907Z - info: Server(main) listening on port 19196

What else would be useful to add to the startup log?

Also, what other features might be useful to see at the healthz endpoint?

Currently:

{
ENV: "development",
path: "/healthz",
version: "1.0.5",
index: "idigbio",
maxRecordsets: 10000,
defaultLimit: 100,
maxLimit: 5000,
maxTileObjects: 10000,
logging_severity: "debug"
}

[danstoner]

hostname (unqualified) could be useful.

[danstoner]

hostname added to healthz in commit f29f8120a17ebdc13fd84f0678a22bd6961bd116