Modify all daemons to re-open log files on receipt of SIGUSR2 signal.  This
    is much than using SIGHUP to re-read the configuration file and rebuild
    various tables.
bug 3070

debug.

bug 3979

Bug 3967

Bug 3979 and 3989

This reverts commit d49081df.

Bug 3979 and 3989

This isn't a memory leak, but does show memory not freed.

will have a time displayed when truncating time.

Bug 3940.

Otherwise we can end up printing Start times greater than End times,
leading to confusion when reading sacct output. 0 is displayed as Unknown.
Cosmetic change.

Bug 3940.

This behavior was introduced in bug 2504, commit 7fb0c981 and bug 2643
commit 988edf12 respectively.

The reasoning is that sysadmins who see nodes with Reason "Not Responding"
but they can manually ping/access the node end up confused. That reason
should only be set if the node is trully not responding, but not if the
HealthCheckProgram execution failed or returned non-zero exit code. For
that case, the program itself would take the appropiate actions, such
as draining the node and setting an appropiate Reason.

Bug 3931

CID 171497

Bug 3963.

Since a list_for_each was being used for reconciling fed_jobs and if
fed_mgr_job_revoke() is called on a non-origin job it will try to purge
the job from the job_list which will deadlock since the list_for_each()
will be holding the job_list's mutex.

CIDs: 45332, 45327, 45326

CID: 171885

Bug 3957.

Was initially added in 734d6f63 but was refactored out in the
heterogenous jobs branch.

When an origin cluster is removed from the federation it could keep
federated jobs in the federation without an origin (e.g. job is viable
on multiple siblings other than the origin cluster). The job should
schedule amongst its siblings when the origin is gone.

When a cluster is removed from the federation, pending jobs should
remain pending.

1. If a job is pending on a origin cluster and the origin is being
removed then leave the pending job on the origin as a non-federated job
and remove the other sibling jobs.

2. If the job is viable on only one cluster than leave it as a pending
as non-federated job on the viable cluster.

3. If the origin cluster is being removed and the job is viable on
multiple clusters other than the origin then leave the sibling jobs as
federated job and the remainin viable clusters will schedule amongst
themselves to start the job.

Previously they were treated as only pending.

With the addition of b9719be2, which deletes the job file in a
separate thread, the job file could still exist when a new sibling job
is being submitted as a requeued fed job. The file needs to deleted
before submitting a new fed sib job.