bug#29992: 'postgres' service doesn't stop

[Clément Lassieur]

1. add (postgresql-service) to the service list
2. reconfigure
3. ps -ef | grep postgres

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postgres 19058     1  0 16:21 ?        00:00:00 
/gnu/store/0v539yjmdqhjm1xcpvndmagkgjz5fvh2-guile-2.2.2/bin/guile 
--no-auto-compile /gnu/store/rp6qyfv5wyznz5a1i6szzzy997v603sl-start-postgres    
                                         
postgres 19061 19058  0 16:21 ?        00:00:00 
/gnu/store/3rg0avphlwgq56qjxd8gr8xbmh1rwkal-postgresql-10.1/bin/postgres 
--config-file=/gnu/store/7m8yrv4avricqkn92737b5mamlvaid34-postgresql.conf -p 
5432 -D /var/lib/postgresql/data     
postgres 19063 19061  0 16:21 ?        00:00:00 postgres: checkpointer process
postgres 19064 19061  0 16:21 ?        00:00:00 postgres: writer process
postgres 19065 19061  0 16:21 ?        00:00:00 postgres: wal writer process
postgres 19066 19061  0 16:21 ?        00:00:00 postgres: autovacuum launcher 
process
postgres 19067 19061  0 16:21 ?        00:00:00 postgres: stats collector 
process
postgres 19068 19061  0 16:21 ?        00:00:00 postgres: bgworker: logical 
replication launcher
clement  19070 18802  0 16:21 pts/4    00:00:00 grep postgres
--8<---------------cut here---------------end--------------->8---

4. herd stop postgres (output: Service postgres has been stopped)
5. ps -ef | grep postgres

--8<---------------cut here---------------start------------->8---
postgres 19061     1  0 16:21 ?        00:00:00 
/gnu/store/3rg0avphlwgq56qjxd8gr8xbmh1rwkal-postgresql-10.1/bin/postgres 
--config-file=/gnu/store/7m8yrv4avricqkn92737b5mamlvaid34-postgresql.conf -p 
5432 -D /var/lib/postgresql/data     
postgres 19063 19061  0 16:21 ?        00:00:00 postgres: checkpointer process
postgres 19064 19061  0 16:21 ?        00:00:00 postgres: writer process
postgres 19065 19061  0 16:21 ?        00:00:00 postgres: wal writer process
postgres 19066 19061  0 16:21 ?        00:00:00 postgres: autovacuum launcher 
process                                 
postgres 19067 19061  0 16:21 ?        00:00:00 postgres: stats collector 
process
postgres 19068 19061  0 16:21 ?        00:00:00 postgres: bgworker: logical 
replication launcher
clement  19078 18802  0 16:21 pts/4    00:00:00 grep postgres
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