ci-operator/step-registry/ipi/conf: Drop to 10m

It's been 1000m since it landed in de3de20 (step-registry: add
configure and install IPI steps, 2020-01-14, openshift#6708), but it's a pretty
simple container (just write a config file), so Steve suggestes 10m as
more appropriate [1].

[1]: openshift#7625 (comment)

Author: wking

ci-operator/step-registry/ipi/conf/ipi-conf-ref.yaml

@@ -4,7 +4,7 @@ ref:
   commands: ipi-conf-commands.sh
   resources:
     requests:
-      cpu: 1000m
+      cpu: 10m
       memory: 100Mi
   documentation: |-
     The IPI configure step generates the install-config.yaml file based on the cluster profile and optional input files.