Fix graceful shutdown

[butonic]

backport of owncloud/ocis#11295
includes #1416 so we should merge that first
requires reva changes opencloud-eu/reva#326

[butonic]

I rebased this PR after the pending PRs got merged. It does include a reva bump which also pulls in other vendor changes.

Other than that the PR changes every service to use the runner package. This allows a clean graceful shutdown of every service.

It can be tested by sending a SIGTERM to the process or hitting Ctrl-C. The log will then show that all services are shutting down.

Without this PR the first reva service completing his Stop function would exit(0) preventing other services from shutting down properly.

[micbar]

It can be tested by sending a SIGTERM to the process or hitting Ctrl-C. The log will then show that all services are shutting down.

On which log level do we log that? Info level?

[micbar]

The overall implementation looks good. I have some questions on the log levels.

[micbar]

Thanks for the improvements, makes the whole process clearer and more consistent.