(maint) Don't expect the logging prefix as a CMake option
(maint) Don't expect the logging prefix as a CMake option

We now use always "puppetlabs.cpp_pcp_client" as the logging prefix.

MikaelSmith/cpp-pcp-client,MikaelSmith/cpp-pcp-client,MikaelSmith/cpp-pcp-client,puppetlabs/cpp-pcp-client,puppetlabs/cpp-pcp-client,puppetlabs/cpp-pcp-client,MikaelSmith/cpp-pcp-client,puppetlabs/cpp-pcp-client,MikaelSmith/cpp-pcp-client