MXS-1220: Deprecate whitespace in object names

All whitespace in object names is now converted to a compacted format with
whitespace replaced with hyphens. If a conversion takes place, a warning
is logged.

Converted some of the tests into C++ as they directly include .cc files.

server/core/utils.cc

@@ -490,6 +490,22 @@ char* trim(char *str)
     return str;
 }
 
+/**
+ * @brief Replace whitespace with hyphens
+ *
+ * @param str String to replace
+ */
+void replace_whitespace(char* str)
+{
+    for (char* s = str; *s; s++)
+    {
+        if (isspace(*s))
+        {
+            *s = '-';
+        }
+    }
+}
+
 /**
  * Replace all whitespace with spaces and squeeze repeating whitespace characters
  *