Run hc_program passive checks more often

[rdjjke]

Problem

Periodic passive checks that should undrain [user_problem] nodes run too rarely.

Solution

Run passive checks in "hc_program" context more often: every 2 minutes instead of 5 minutes.

Testing

1. Create a new cluster
2. Check scontrol show config | grep HealthCheckInterval

Release Notes

Slurm HealthCheckProgram is launched every 2 minutes instead of 5 minutes.