Remove skygw_utils.h

The general purpose stuff in skygw_utils.h was moved to utils.h
and the corresponding implementation from skygw_utils.cc to utils.c.
Includes updated accordingly.

Skygw_utils.h is now only used by log_manager and by mlist, which
is only used by log_manager. Consequently, skygw_utils.h was moved
to server/maxscale.

Utils.h needs a separate overhaul.

query_classifier/qc_sqlite/qc_sqlite.c

@@ -20,7 +20,6 @@
 #include <maxscale/protocol/mysql.h>
 #include <maxscale/platform.h>
 #include <maxscale/query_classifier.h>
-#include <maxscale/skygw_utils.h>
 #include <maxscale/modutil.h>
 #include <maxscale/alloc.h>
 #include "builtin_functions.h"

query_classifier/test/canonical_tests/canonizer.c

@@ -18,7 +18,7 @@
 #include <maxscale/query_classifier.h>
 #include <maxscale/buffer.h>
 #include <maxscale/gwdirs.h>
-#include <maxscale/skygw_utils.h>
+#include <maxscale/utils.h>
 
 int main(int argc, char** argv)
 {