Divide poll.h to core and public headers

Also some cleanup of other headers.

server/core/test/test_utils.h

@@ -15,14 +15,16 @@
  */
 
 #include <maxscale/cdefs.h>
-#include <maxscale/poll.h>
 #include <maxscale/dcb.h>
 #include <maxscale/housekeeper.h>
 #include <maxscale/maxscale_test.h>
 #include <maxscale/log_manager.h>
 #include <maxscale/config.h>
+
+#include "../maxscale/poll.h"
 #include "../maxscale/statistics.h"
 
+
 void init_test_env(char *path)
 {
     int argc = 3;

server/core/test/testpoll.c

@@ -33,9 +33,9 @@
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
-#include <maxscale/poll.h>
 #include <maxscale/dcb.h>
 #include <maxscale/listener.h>
+
 #include "test_utils.h"
 
 /**

server/core/test/testqueuemanager.c

@@ -41,6 +41,7 @@ extern int debug_check_fail;
 #include <maxscale/random_jkiss.h>
 #include <maxscale/hk_heartbeat.h>
 #include <maxscale/alloc.h>
+
 #include "test_utils.h"
 
 /**

server/core/test/testservice.c

@@ -33,9 +33,10 @@
 #include <stdlib.h>
 #include <string.h>
 #include <maxscale/maxscale_test.h>
-#include "../maxscale/service.h"
 #include <maxscale/paths.h>
 #include <maxscale/alloc.h>
+
+#include "../maxscale/service.h"
 #include "test_utils.h"
 
 /**