Rename TimeoutKill to TimeoutStart.
Rename TimeoutFinish to TimeoutStop.
Remove TimeoutUp and TimeoutDown key.
To avoid confusion and mistake, oneshot and classic service use now
the same key name to declare the timeout to use.
TimeoutStart and TimeoutStop are clearer than TimeoutKill and TimeoutFinish.
66 is sufficiently smart to name the file correctly for s6-supervise
whick look for the timeout-kill and timeout-finish file.

Sending signal to the fdholder socket at each loop is really a bad design.

This process handle a service selection from a same live directory.As any contents of the field fdholderdir will be valid,
a simple call at the end of process will do the needs.

an already unsupervised service.

This is the unsupervise process, at worse the service isn't supervised.

This reverts commit 87bd69c6.

Service may not be supervised, in this case the ssexec_stop function do not find the service to remove and its requiredby dependencies and refuse to remove the service. Whatever the state of the service, the service must be removed.

s6-supervise do not deal with oneshot service. If we send a -r signal, oneshot service are never brought up again