Fixes to coverity bugs:
72670: query_classifier/query_classifier.cc
72682: server/modules/filter/qlafilter.c
72679: server/modules/filter/tee.c
72716: server/modules/protocol/maxscaled.c
72694: server/modules/protocol/telnetd.c
71743: server/modules/routing/readwritesplit/readwritesplit.c
Merge branch 'develop' of https://github.com/mariadb-corporation/MaxScale into develop