Loose / indirect dependencies in testutils libraries
This should not have customer impact but Makefile.am files for testutils libraries show loose / indirect dependencies.
Usually indirect dependencies work but not in all cases.
The right way to find dependencies is to use ldd (otool -L on macOS) to list dependencies from the library object. Note that dependencies should be added in the right order i.e. the reserve order src/lib/Makefile.am
build them. Do not forget external (i.e. not Kea) dependencies too as the crypto backend.