Remove the word "Error" from ERS Issue declaration

[eflumerf]

https://github.com/DUNE-DAQ/appfwk/blob/1f8ce77ccdf23b8e068b8096218cfb26dd87d80e/include/appfwk/ConfigurationManager.hpp#L38C1-L41C81

[eflumerf]

Also, determine if this line should be an info or a warning:
https://github.com/DUNE-DAQ/appfwk/blob/develop/src/DAQModuleManager.cpp#L79