[client-connect] drop rqlst on rset returned client side
The DBAPI used to drop the RQL syntax tree on rset to save bandwidth. We could
stop doing it for In-memory client connection. However keeping the syntax tree
leads to multiple tests failures. So we keep dropping it as the DBAPI always
did.
related to #2503918
option_group_changed('port', 'main', 'web')
option_group_changed('query-log-file', 'main', 'web')
option_group_changed('profile', 'main', 'web')
option_group_changed('max-post-length', 'main', 'web')