MINOR: peers: Make outgoing connection to SSL/TLS peers work.

This patch adds pointer to a struct server to peer structure which
is initialized after having parsed a remote "peer" line.

After having parsed all peers section we run ->prepare_srv to initialize
all SSL/TLS stuff of remote perr (or server).

Remaining thing to do to completely support peer protocol over SSL/TLS:
make "bind" keyword be supported in "peers" sections to make SSL/TLS
incoming connections to local peers work.

May be backported to 1.5 and newer.
diff --git a/src/peers.c b/src/peers.c
index e580f2c..d4d3859 100644
--- a/src/peers.c
+++ b/src/peers.c
@@ -39,6 +39,7 @@
 #include <proto/log.h>
 #include <proto/hdr_idx.h>
 #include <proto/mux_pt.h>
+#include <proto/peers.h>
 #include <proto/proxy.h>
 #include <proto/session.h>
 #include <proto/stream.h>
@@ -1996,10 +1997,10 @@
 	if (unlikely((cs = cs_new(conn)) == NULL))
 		goto out_free_conn;
 
-	conn->target = s->target = &s->be->obj_type;
+	conn->target = s->target = peer_session_target(peer, s);
 	memcpy(&conn->addr.to, &peer->addr, sizeof(conn->addr.to));
 
-	conn_prepare(conn, peer->proto, peer->xprt);
+	conn_prepare(conn, peer->proto, peer_xprt(peer));
 	conn_install_mux(conn, &mux_pt_ops, cs, s->be, NULL);
 	si_attach_cs(&s->si[1], cs);