Bug#11765108 (Bug#58036) client utf32, utf16, ucs2 should be disallowed, they crash server

Problem: ucs2 was correctly disallowed in "SET NAMES" only,
while mysql_real_connect() and mysql_change_user() still allowed
to use ucs2, which made server crash.

Fix: disallow ucs2 in mysql_real_connect() and mysql_change_user().

  @ sql/set_var.cc
    Using new function.

  @ sql/sql_acl.cc
    - Return error if character set initialization failed
    - Getting rid of pointer aliasing:
      Initialize user_name to NULL, to avoid double free().

  @ sql/sql_connect.cc
    - in case of unsupported client character set send error and return true
    - in case of success return false

  @ sql/sql_connect.h
    - changing return type for thd_init_client_charset() to bool,
      to return errors to the caller

  @ sql/sql_parse.h
    - introducing a new function, to reuse in all places where we need
    to check client character set.

  @ tests/mysql_client_test.c
    Adding test

sql/sql_parse.h

@@ -197,4 +197,10 @@ check_table_access(THD *thd, ulong requirements,TABLE_LIST *tables,
 
 bool check_global_access(THD *thd, ulong want_access);
 
+inline bool is_supported_parser_charset(CHARSET_INFO *cs)
+{
+  return test(cs->mbminlen == 1);
+}
+
+
 #endif /* SQL_PARSE_INCLUDED */