SHOW STATUS does not anymore change local status variables (except com_show_status). Global status variables are still updated.

SHOW STATUS are not anymore put in slow query log because of no index usage.

Implemntation done by removing orig_sql_command and moving logic of SHOW STATUS to mysql_excute_command()
This simplifies code and allows us to remove some if statements all over the code.

Upgraded uc_update_queries[] to sql_command_flags and added more bitmaps to better categorize commands.
This allowed some overall simplifaction when testing sql_command.

Fixes bugs:
Bug#10210: running SHOW STATUS increments counters it shouldn't
Bug#19764: SHOW commands end up in the slow log as table scans

mysql-test/r/query_cache.result

@@ -1050,6 +1050,7 @@ Qcache_hits	1
 drop table t1;
 create table t1 (a int);
 insert into t1 values (1),(2);
+drop procedure if exists p1;
 CREATE PROCEDURE `p1`()
 begin
 Declare c1 cursor for select a from t1;