Bug #418, added functions to query classifier to detect if SET autocommit is called.
Note: this compiles but doesn't work yet properly.
Fix for bug #418
Increased skygw_query_type_t to 16 bits, and corrected the way how those bit fields are checked.
Added tests for cases where autocommit is disabled and corrected old tests.
Merge branch 'develop' of https://github.com/skysql/MaxScale into develop