server/core/test/makefile and
server/modules/filter/Makefile: Added path to libmysqld (-L<path>) so that linker finds it at compile time.
server/test/MaxScale_template.cnf: added write_ses_variables_to_all=Yes and read_ses_variables_from_slaves=Yes so that tests included in testall target succeed (at server/modules/routing/readwritesplit/test). Added hint filter to 'normal' rwsplit service.