Wrong logging output for `ADM_ping`

The ping RPC in the CXX api prints the following:

    LOGGER_INFO("ADM_ping()");

    ...
    LOGGER_INFO("ADM_register_job() = {}", ADM_SUCCESS);

Should be fixed.

changed milestone to %ADMIRE mid-term review

added bug in progress labels

assigned to @amiranda

mentioned in merge request !44 (merged)

mentioned in commit 007146f2

closed with merge request !44 (merged)