Move headers from server/include to include/maxscale

- Headers now to be included as <maxscale/xyz.h>
- First step, no cleanup of headers has been made. Only moving
  from one place to another + necessary modifications.

server/core/service.c

@@ -42,30 +42,30 @@
 #include <string.h>
 #include <ctype.h>
 #include <errno.h>
-#include <session.h>
-#include <service.h>
-#include <gw_protocol.h>
-#include <listener.h>
-#include <server.h>
-#include <router.h>
-#include <spinlock.h>
-#include <modules.h>
-#include <dcb.h>
-#include <users.h>
-#include <filter.h>
-#include <dbusers.h>
+#include <maxscale/session.h>
+#include <maxscale/service.h>
+#include <maxscale/gw_protocol.h>
+#include <maxscale/listener.h>
+#include <maxscale/server.h>
+#include <maxscale/router.h>
+#include <maxscale/spinlock.h>
+#include <maxscale/modules.h>
+#include <maxscale/dcb.h>
+#include <maxscale/users.h>
+#include <maxscale/filter.h>
+#include <maxscale/dbusers.h>
 #include <maxscale/poll.h>
-#include <skygw_utils.h>
-#include <log_manager.h>
+#include <maxscale/skygw_utils.h>
+#include <maxscale/log_manager.h>
 #include <sys/stat.h>
 #include <sys/types.h>
-#include <housekeeper.h>
-#include <resultset.h>
-#include <gw.h>
-#include <gwdirs.h>
+#include <maxscale/housekeeper.h>
+#include <maxscale/resultset.h>
+#include <maxscale/gw.h>
+#include <maxscale/gwdirs.h>
 #include <math.h>
-#include <version.h>
-#include <queuemanager.h>
+#include <maxscale/version.h>
+#include <maxscale/queuemanager.h>
 #include <maxscale/alloc.h>
 
 /** To be used with configuration type checks */