WL#5030: Split and remove mysql_priv.h

This patch:

- Moves all definitions from the mysql_priv.h file into
  header files for the component where the variable is
  defined
- Creates header files if the component lacks one
- Eliminates all include directives from mysql_priv.h
- Eliminates all circular include cycles
- Rename time.cc to sql_time.cc
- Rename mysql_priv.h to sql_priv.h

sql/rpl_utility.h

@@ -20,7 +20,11 @@
 #error "Don't include this C++ header file from a non-C++ file!"
 #endif
 
-#include "mysql_priv.h"
+#include "sql_priv.h"
+#include "m_string.h"                           /* bzero, memcpy */
+#ifdef MYSQL_SERVER
+#include "table.h"                              /* TABLE_LIST */
+#endif
 #include "mysql_com.h"
 
 class Relay_log_info;