Fix to bug #513, http://bugs.skysql.com/show_bug.cgi?id=513
Added a dummy session and dcb to the filter harness.
Added tests for regexfilter.
Merge branch 'develop' of https://github.com/mariadb-corporation/MaxScale into develop

Conflicts:
	server/modules/filter/test/harness_common.c
MAX-328, Add session identifier to trace log entries. Session id is given to session in session_alloc and stored to thread's local storage variable when thread picks a new event from epoll_wait.
Merge branch 'develop' of https://github.com/mariadb-corporation/MaxScale into develop
Merge branch 'develop' into firewall

Conflicts:
	server/modules/filter/test/CMakeLists.txt
	server/modules/filter/test/harness_common.c
Fixed errors in filter harness file comparing.