Fix tests for pt-slave-restart

$ prove -vw --trap --timer t/pt-slave-restart/
[18:10:50] t/pt-slave-restart/gtid.t ...................... # Restarting the sandbox
DBD::mysql::db do failed: LOAD DATA LOCAL INFILE file request rejected due to restrictions on access. [for Statement "LOAD DATA LOCAL INFILE '/tmp/load_data_test.2671988' INTO TABLE percona_test.load_data"] at ../util/check-load-data line 48.
# MySQL test server on port 12349 does not exist.
# MySQL test server on port 12348 does not exist.
# Stopping MySQL test server on port 12347... OK (4s)
# Stopping MySQL test server on port 12346... OK (12s)
# Stopping MySQL test server on port 12345... OK (12s)
# MySQL test server on port 2903 does not exist.
# MySQL test server on port 2902 does not exist.
# MySQL test server on port 2901 does not exist.
# MySQL test server on port 2900 does not exist.
# Percona Toolkit test environment stopped.
# master 12345
# Creating default databases ...
# Starting MySQL test server on port 12345... return 0
# OK (2s)
# Creating default databases ...
# Starting MySQL test server on port 12346... return 0
# OK (3s)
# Creating default databases ...
# Starting MySQL test server on port 12347... return 0
# OK (3s)
# LOAD DATA LOCAL INFILE is disabled
# Waiting for replication to finish... OK
# Percona Toolkit test environment started with MySQL v8.0.
# Sandbox restarted

not ok 1 - slave: Replication broke

#   Failed test 'slave: Replication broke'
#   at t/pt-slave-restart/gtid.t line 112.
#                   'Coordinator stopped because there were error(s) in the worker(s). The most recent failure being: Worker 1 failed executing transaction '5fcd75ca-8dd4-11ed-9d8c-98af65266957:22' at master log mysql-bin.000002, end_log_pos 8231. See error log and/or performance_schema.replication_applier_status_by_worker table for more details about this failure or others, if any.'
#     doesn't match '(?^:Table 'test.t' doesn't exist')'
not ok 2 - Event is skipped
Bailout called.  Further testing stopped:  Replication is broken
Bail out!  Replication is broken

#   Failed test 'Event is skipped'
#   at t/pt-slave-restart/gtid.t line 123.
#                   '1146'
#     doesn't match '(?^:^0$)'
FAILED--Further testing stopped: Replication is broken