Enhance pytest
Compare changes
Rename instance.killpg -> kill().
The intention is to eliminate ambiguity with os.killpg. Make the
Instance API more like subprocess module (as regards kill and terminate
functions).
Log more instance management events:
Instance(i1, listen=127.0.0.1:3301) starting...
Instance(i1, listen=127.0.0.1:3301) is ready
Instance(i1, listen=127.0.0.1:3301) is trying to become a leader
Instance(i1, listen=127.0.0.1:3301) is a leader now
Instance(i1, listen=127.0.0.1:3301) terminated
Instance(i1, listen=127.0.0.1:3301) starting...
Instance(i1, listen=127.0.0.1:3301) killed