fix: chrony NTP settings

[skrobul]

The time.rackspace.net does not exist anymore, it has to be region specific now. This change also includes fallback to two other NTP pools.

This PR resolves a bug where the booted IPA image did not have the correct time set.

root@debian:~# chronyc tracking
Reference ID    : 0A04CC03 (10.4.204.3)
Stratum         : 4
Ref time (UTC)  : Wed Nov 13 12:22:59 2024
System time     : 0.000000373 seconds slow of NTP time
Last offset     : +0.000354720 seconds
RMS offset      : 0.000183107 seconds
Frequency       : 3.873 ppm slow
Residual freq   : +1.198 ppm
Skew            : 1.266 ppm
Root delay      : 0.011129249 seconds
Root dispersion : 0.018068938 seconds
Update interval : 130.0 seconds
Leap status     : Normal
root@debian:~#

Closes PUC-413