BUG#121915: Merge 4.1->5.0

mysql-test/r/update.result:
  Auto merged
mysql-test/t/update.test:
  Auto merged
sql/mysql_priv.h:
  Auto merged
sql/mysqld.cc:
  Auto merged
sql/records.cc:
  Auto merged
sql/repl_failsafe.cc:
  Auto merged
sql/slave.cc:
  Auto merged
sql/structs.h:
  Auto merged

sql/sql_class.cc

@@ -218,6 +218,7 @@ THD::THD()
 #ifndef EMBEDDED_LIBRARY
   net.vio=0;
 #endif
+  client_capabilities= 0;                       // minimalistic client
   net.last_error[0]=0;                          // If error on boot
   net.query_cache_query=0;                      // If error on boot
   ull=0;