This Improvement will make it easier for CSIT to avoid launching tests while ODL is still busy booting up. There are better ways to publish config readiness (might be implemented later), but logging change is the simplest. Especially since the message is already there [0], but only on DEBUG level.

[0] https://git.opendaylight.org/gerrit/gitweb?p=controller.git;a=blob;f=opendaylight/config/config-persister-impl/src/main/java/org/opendaylight/controller/config/persist/impl/ConfigPusherImpl.java;h=6fcc7dcd4d14b9d04bbad384f9ac38214e6da911;hb=refs/heads/stable/carbon#l139