Addition to Fix of bug #585, http://bugs.mariadb.com/show_bug.cgi?id=585
regexfilter.c:routeQuery called modutil_replace_SQL which resulted in multiple buffers in query GWBUF. Those weren't handled properly later. Added call for gwbug_make_contiguous.
Merge branch 'develop' of https://github.com/mariadb-corporation/MaxScale into develop