Title: #932: replica-conncheck: log when failed to RPC connect
It's nearly impossible to find out what happened when doing
replica connection check and it fails during the RPC phase.
The error is now logged.
To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/932/head:pr932
git checkout pr932