IPA: add chrony.conf with no default NTP pools

This removes unnecessary attempts to contact random NTP servers on the
internet.

Author: skrobul

ironic-images/ipa-debian-bookworm.yaml

@@ -6,3 +6,4 @@
   - journal-to-console
   - package-installs
   - undercloud-ipa
+  - install-static

ironic-images/static/etc/chrony/chrony.conf

@@ -0,0 +1,41 @@
+# Include configuration files found in /etc/chrony/conf.d.
+confdir /etc/chrony/conf.d
+
+# Do not Use Debian vendor zone.
+# This was commented out to make sure that we only use NTP sources
+# configured through DHCP.
+# pool 2.debian.pool.ntp.org iburst
+
+# Use time sources from DHCP.
+sourcedir /run/chrony-dhcp
+
+# Use NTP sources found in /etc/chrony/sources.d.
+sourcedir /etc/chrony/sources.d
+
+# This directive specify the location of the file containing ID/key pairs for
+# NTP authentication.
+keyfile /etc/chrony/chrony.keys
+
+# This directive specify the file into which chronyd will store the rate
+# information.
+driftfile /var/lib/chrony/chrony.drift
+
+# Save NTS keys and cookies.
+ntsdumpdir /var/lib/chrony
+
+# Uncomment the following line to turn logging on.
+#log tracking measurements statistics
+
+# Log files location.
+logdir /var/log/chrony
+
+# Stop bad estimates upsetting machine clock.
+maxupdateskew 100.0
+
+# This directive enables kernel synchronisation (every 11 minutes) of the
+# real-time clock. Note that it can't be used along with the 'rtcfile' directive.
+rtcsync
+
+# Step the system clock instead of slewing it if the adjustment is larger than
+# one second, but only in the first three clock updates.
+makestep 1 3