pcap-log: unify lock handling, fixes Coverity warn

*** CID 1229124:  Data race condition  (MISSING_LOCK)
/src/log-pcap.c: 363 in PcapLog()
357         {
358             return TM_ECODE_OK;
359         }
360
361         PcapLogLock(pl);
362
>>>     CID 1229124:  Data race condition  (MISSING_LOCK)
>>>     Accessing "pl->pkt_cnt" without holding lock "PcapLogData_.plog_lock". Elsewhere, "PcapLogData_.pkt_cnt" is accessed with "PcapLogData_.plog_lock" held 1 out of 2 times (1 of these accesses strongly imply that it is necessary).
363         pl->pkt_cnt++;
364         pl->h->ts.tv_sec = p->ts.tv_sec;
365         pl->h->ts.tv_usec = p->ts.tv_usec;
366         pl->h->caplen = GET_PKT_LEN(p);
367         pl->h->len = GET_PKT_LEN(p);
368         len = sizeof(*pl->h) + GET_PKT_LEN(p);
pcap-log: yaml comment update
Add input interface's name to JSON log
Reduce reallocation in AC Tile MPM creation.

Exponentially increase the memory allocated for new states when adding new
states, then at the end resize down to the actually final size so that no space is wasted.
Update app-layer-htp.c

When keyword "boundary=" doesn't exist in the http_header, the value of r is 0 and this condition shouldn't return 0 instead 1;
eve: add tx_id to output for alerts and events

Add tx_id field for correlating alerts and events per tx.