hpts: make stacks responsible for tcp_hpts_init()

Those stacks that use HPTS should care about init, not generic code.

Reviewed by:		imp, tuexen, rrs
Differential Revision:	https://reviews.freebsd.org/D42856

(cherry picked from commit 2b3a77467dd3d74a7170f279fb25f9736b46ef8a)

sys/netinet/tcp_stacks/bbr.c

@@ -9926,6 +9926,8 @@ bbr_init(struct tcpcb *tp, void **ptr)
 	struct tcp_bbr *bbr = NULL;
 	uint32_t cts;
 
+	tcp_hpts_init(tp);
+
 	*ptr = uma_zalloc(bbr_pcb_zone, (M_NOWAIT | M_ZERO));
 	if (*ptr == NULL) {
 		/*

sys/netinet/tcp_stacks/rack.c

@@ -14973,6 +14973,8 @@ rack_init(struct tcpcb *tp, void **ptr)
 	uint32_t iwin, snt, us_cts;
 	int err, no_query;
 
+	tcp_hpts_init(tp);
+
 	/*
 	 * First are we the initial or are we a switched stack?
 	 * If we are initing via tcp_newtcppcb the ptr passed

sys/netinet/tcp_subr.c

@@ -2315,9 +2315,6 @@ tcp_newtcpcb(struct inpcb *inp)
 	 * which may match an IPv4-mapped IPv6 address.
 	 */
 	inp->inp_ip_ttl = V_ip_defttl;
-#ifdef TCPHPTS
-	tcp_hpts_init(tp);
-#endif
 #ifdef TCPPCAP
 	/*
 	 * Init the TCP PCAP queues.