stop-server and restart-server address all services which talk to the
database, and are thus more correct than restarting or stopping
everything in supervisor.
This is possible now that the previous commit ensures that the zulip
user can read the zulip installation directory during
`create-database`; previously, that directory was still owned by root
when `create-database` was run, whereas now it is in
`~zulip/deployments/`.
We can probably later merge the create-database code with that of our
internal do-destroy-rebuild-database.
(imported from commit 323932dbf2eb916545d6ebdda70eb1f5e1abb181)
Alex Vandiver
Tim Abbott