MDEV-36477 MDEV-35452 Fix Spider tests with view protocol fail with "Failed to drop view: 0: "

The failure is caused by exec $stmt where $stmt has two queries.
mtr with view protocol transforms the first query into a view, leaving
the second query executed in the usual way. mtr being oblivious about
the second query then does not handle its results, resulting in
CR_COMMANDS_OUT_OF_SYNC. We disable view protocol for such edge cases.
After fixing these "Failed to drop view: 0: " further failures emerge
from two of the tests, which are the same problem as MDEV-36454, so we
fix them to by disabling view protocol for the relevant SELECTs.

storage/spider/mysql-test/spider/bugfix/include/mdev_21884_init.inc

@@ -43,8 +43,6 @@ let $CHILD2_1_CREATE_TABLES=
     PRIMARY KEY(a,b)
   ) $CHILD2_1_ENGINE $CHILD2_1_CHARSET;
 --let $CHILD2_1_SELECT_TABLES_BACKUP= $CHILD2_1_SELECT_TABLES
-let $CHILD2_1_SELECT_TABLES=
-  SELECT pkey, txt FROM tbl_a ORDER BY pkey;
 let $CHILD2_1_SELECT_TABLES=
   SELECT a, b, c FROM ta_r2 ORDER BY a $STR_SEMICOLON
   SELECT a, b, c FROM ta_r3 ORDER BY a;

storage/spider/mysql-test/spider/bugfix/t/mdev_20100.test

@@ -58,25 +58,33 @@ TRUNCATE TABLE mysql.general_log;
 
 --connection master_1
 --disable_ps2_protocol
+--disable_view_protocol
 SELECT a, b, c FROM tbl_a PARTITION (pt2) WHERE b = 'c';
+--enable_view_protocol
 SELECT a, b, c FROM tbl_a PARTITION (pt1,pt2);
+--disable_view_protocol
 SELECT a, b, c FROM tbl_a PARTITION (pt3) WHERE b = 'c';
+--enable_view_protocol
 SELECT a, b, c FROM tbl_a PARTITION (pt1,pt2);
+--disable_view_protocol
 SELECT a, b, c FROM tbl_a PARTITION (pt1) WHERE b = 'c';
+--enable_view_protocol
 SELECT a, b, c FROM tbl_a PARTITION (pt1,pt3);
+--disable_view_protocol
 SELECT a, b, c FROM tbl_a PARTITION (pt1) WHERE b = 'c';
+--enable_view_protocol
 SELECT a, b, c FROM tbl_a PARTITION (pt2,pt3);
 --enable_ps2_protocol
 
 --connection child2_1
---disable_ps2_protocol
 --disable_view_protocol
+--disable_ps2_protocol
 eval $CHILD2_1_SELECT_ARGUMENT1;
---enable_view_protocol
 --enable_ps2_protocol
 --disable_ps_protocol
 eval $CHILD2_1_SELECT_TABLES;
 --enable_ps_protocol
+--enable_view_protocol
 
 --echo
 --echo deinit

storage/spider/mysql-test/spider/bugfix/t/mdev_21884.test

@@ -85,10 +85,10 @@ SET NAMES utf8;
 --disable_ps2_protocol
 eval $CHILD2_1_SELECT_ARGUMENT1;
 --enable_ps2_protocol
---enable_view_protocol
 --disable_ps_protocol
 eval $CHILD2_1_SELECT_TABLES;
 --enable_ps_protocol
+--enable_view_protocol
 
 --echo
 --echo deinit

storage/spider/mysql-test/spider/regression/e1121/t/direct_join_by_pkey_key.test

@@ -60,6 +60,7 @@ INSERT INTO tbl_b (bkey,akey) VALUES (0,0),(1,1),(2,2),(3,3),(4,4),(5,4),(6,3),(
 --connection child2_1
 TRUNCATE TABLE mysql.general_log;
 
+--disable_view_protocol
 --connection master_1
 --disable_ps2_protocol
 SELECT a.val, a.akey FROM tbl_a a, tbl_b b WHERE a.akey = b.akey AND b.bkey = 5;
@@ -67,11 +68,10 @@ SELECT a.val, a.akey FROM tbl_a a, tbl_b b WHERE a.akey = b.akey AND b.bkey = 5;
 
 --connection child2_1
 --disable_ps_protocol
---disable_view_protocol
 eval $CHILD2_1_SELECT_ARGUMENT1;
---enable_view_protocol
 eval $CHILD2_1_SELECT_TABLES;
 --enable_ps_protocol
+--enable_view_protocol
 
 --echo
 --echo deinit

storage/spider/mysql-test/spider/regression/e1121/t/direct_join_by_pkey_pkey.test

@@ -69,8 +69,8 @@ SELECT a.val, a.akey FROM tbl_a a, tbl_b b WHERE a.akey = b.akey AND b.bkey = 5;
 --disable_ps_protocol
 --disable_view_protocol
 eval $CHILD2_1_SELECT_ARGUMENT1;
---enable_view_protocol
 eval $CHILD2_1_SELECT_TABLES;
+--enable_view_protocol
 --enable_ps_protocol
 
 --echo