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/modules/routing/binlog/binlog_common.c

@@ -18,7 +18,7 @@
 #include <unistd.h>
 #include <binlog_common.h>
 #include <blr_constants.h>
-#include <log_manager.h>
+#include <maxscale/log_manager.h>
 
 /**
  * @file binlog_common.c - Common binary log code shared between multiple modules