[MAJOR] call garbage collector when doing soft stop

When we're interrupted by another instance, it is very likely
that the other one will need some memory. Now we know how to
free what is not used, so let's do it.

Also only free non-null pointers. Previously, pool_destroy()
did implicitly check for this case which was incidentely
needed.

src/haproxy.c

@@ -203,6 +203,7 @@ void usage(char *name)
 void sig_soft_stop(int sig)
 {
 	soft_stop();
+	pool_gc2();
 	signal(sig, SIG_IGN);
 }
 
@@ -212,6 +213,7 @@ void sig_soft_stop(int sig)
 void sig_pause(int sig)
 {
 	pause_proxies();
+	pool_gc2();
 	signal(sig, sig_pause);
 }
 
@@ -318,6 +320,7 @@ void sig_int(int sig)
 	   0 GRACE time
 	*/
 	fast_stop();
+	pool_gc2();
 	/* If we are killed twice, we decide to die*/
 	signal(sig, SIG_DFL);
 }
@@ -330,6 +333,7 @@ void sig_term(int sig)
 	   0 GRACE time
 	*/
 	fast_stop();
+	pool_gc2();
 	/* If we are killed twice, we decide to die*/
 	signal(sig, SIG_DFL);
 }
@@ -580,7 +584,7 @@ void init(int argc, char **argv)
 
 void deinit(void)
 {
-	struct proxy *p = proxy;
+	struct proxy *p = proxy, *p0;
 	struct cap_hdr *h,*h_next;
 	struct server *s,*s_next;
 	struct listener *l,*l_next;
@@ -654,7 +658,9 @@ void deinit(void)
 	
 		pool_destroy2(p->req_cap_pool);
 		pool_destroy2(p->rsp_cap_pool);
+		p0 = p;
 		p = p->next;
+		free(p0);
 	}/* end while(p) */
     
 	if (global.chroot)    free(global.chroot);