[shepherd] branch wip-service-monitor created (now da158c5)

[Ludovic Courtès]

civodul pushed a change to branch wip-service-monitor
in repository shepherd.

      at da158c5  herd: Report 'starting' and 'stopping' service statuses.

This branch includes the following new commits:

     new 746daf4  service: Remove 'stop-delay?' and 'waiting-for-termination?'.
     new 08510a2  service: Handle service state in a monitoring agent.
     new 0f75fb4  service: 'start' blocks when a service is already being 
started.
     new c195b87  service: Start dependent services in parallel.
     new e0cae14  service: 'start-in-the-background' starts services in 
parallel.
     new 310bdb2  service: 'stop' blocks when a service is already being 
stopped.
     new a460085  service: 'service-running-value' uses a fresh channel for 
each reply.
     new 6ad9c92  service: Associate a control fiber with each service.
     new 55a2754  service: Rename "service monitor" to "service registry".
     new 1ad6ac5  service: Clarify expected statuses.
     new e522859  service: Communicate the service status symbol to clients.
     new da158c5  herd: Report 'starting' and 'stopping' service statuses.

The 12 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "add" were already present in the repository and have only
been added to this reference.