disable session_track_schema for perfschema.socket_summary_by_instance_func

because it counts number of bytes sent and expects it to be independent
from the database name length

mysql-test/suite/perfschema/r/socket_summary_by_instance_func.result

+set global session_track_schema=FALSE;
 # The logging of commands and result sets is mostly disabled.
 # There are some messages which help to observe the progress of the test.
 # In case some check fails
@@ -218,3 +219,4 @@ connection default;
 TRUNCATE TABLE performance_schema.socket_summary_by_instance;
 # 6. Cleanup
 connection default;
+set global session_track_schema=DEFAULT;

mysql-test/suite/perfschema/t/socket_summary_by_instance_func.test

@@ -38,6 +38,7 @@
 # prepared statement.
 --source include/no_protocol.inc
 
+set global session_track_schema=FALSE;
 
 #===================================
 # Set IP address defaults with respect to IPV6 support
@@ -1710,3 +1711,4 @@ DROP SCHEMA mysqlsupertest;
 --connection default
 --enable_query_log
 
+set global session_track_schema=DEFAULT;