If you look at your log output, the following lines appear towards the end:
local-postgres9.5 | server stopped
local-postgres9.5 |
local-postgres9.5 | PostgreSQL init process complete; ready for start up.
Apparently, stopping and restarting the Postgres server is part of the initialisation process. In fact, the second-to-last line says
local-postgres9.5 | LOG: database system is ready to accept connections.