Reset some flow flags when port numbers are re-used and we re-use the
flow as a part of a new session.
Remove the unused flow flags - FLOW_TS_PM_PP_ALPROTO_DETECT_DONE and
FLOW_TC_PM_PP_ALPROTO_DETECT_DONE.
Remove unused vars alp_content_module_handle and proto_map from
struct AlpProtoDetectCtx.
Fix mem leak in b2g.
Fix a leak in app layer parser proto code.  Free the proto signatures
allocated internally for PM parser.
Fix a leak in probing parsers.  We were freeing just the head of the list,
instead of all the members.
Fix a leak in detection engine context's temporary buffers used by http
client body, server body and headers.