Disable the tests failing under valgrind because of bug #55503

mysql-test/suite/innodb_plugin/t/innodb-autoinc-44030.test

 -- source include/have_innodb_plugin.inc
 # embedded server ignores 'delayed', so skip this
 -- source include/not_embedded.inc
+# remove the next line after bug #55503 is fixed
+-- source include/not_valgrind.inc
 
 let $innodb_file_format_check_orig=`select @@innodb_file_format_check`;
 

mysql-test/suite/innodb_plugin/t/innodb-autoinc.test

 -- source include/have_innodb_plugin.inc
 # embedded server ignores 'delayed', so skip this
 -- source include/not_embedded.inc
+# remove the next line after bug #55503 is fixed
+-- source include/not_valgrind.inc
 
 let $innodb_file_format_check_orig=`select @@innodb_file_format_check`;