RHEL8 runners in 5.7 seem to be missing python

[ 32%] rocksdb.rocksdb_deadlock_stress_rc 'write_prepared' w1 [ fail ]
        Test ended at 2019-03-23 14:02:18

CURRENT_TEST: rocksdb.rocksdb_deadlock_stress_rc
sh: python: command not found
mysqltest: In included file ./suite/rocksdb/include/rocksdb_deadlock_stress.inc at line 15:
included from /tmp/results/PS/mysql-test/suite/rocksdb/t/rocksdb_deadlock_stress_rc.test at line 2:
At line 15: command "python suite/rocksdb/include/rocksdb_deadlock_stress.py root 127.0.0.1 $MASTER_MYPORT test t1 10000 10" failed