Fix race conditions closing HTTP I/O objects:
This fixes a case where stop can sometimes skip calling close on some
I/O objects or crash in a rare circumstance where a connection is in the
process of being torn down at the exact time the server is stopped. When
the acceptor receives errors, it logs the error and continues listening
instead of stopping.
[WIP] Add script to start/stop rippled

[WIP] Tweak script
* Use `node bin/stop-test.js 5,10` form instead of ENV_VAR
* Log the rippled  pid
* Don't abort on stalls unless an environment variable set

[WIP] Tweak logging

[WIP] Fix

[WIP] Run through the range again on completion

[WIP] Tweak so can use non integer range elements