flaky external_connector_test

[deepthi]

E0515 19:04:08.601403 8368 engine.go:669] Error waiting for pos: MariaDB/0-1-1084, last pos: MariaDB/0-1-1083: context canceled, wait time: 28.471µs
--- FAIL: TestExternalConnectorCopy (2.02s)
external_connector_test.go:179: unexpected query: begin
external_connector_test.go:121: query:
"insert into tab3(id,val) values (1,'a'), (2,'b')", does not match query 0:
"begin"
external_connector_test.go:121: query:
"update _vt.copy_state set lastpk='fields:<name:\"id\" type:INT32 > rows:<lengths:1 values:\"2\" > ' where vrepl_id=3 and table_name='tab3'", does not match query 1:
"insert into tab3(id,val) values (1,'a'), (2,'b')"
external_connector_test.go:121: query:
"commit", does not match query 2:
"/update _vt.copy_state"
external_connector_test.go:121: query:
"delete from _vt.copy_state where vrepl_id=3 and table_name='tab3'", does not match query 3:
"commit"
external_connector_test.go:121: query:
"update _vt.vreplication set state='Running', message='' where id=3", does not match query 4:
"/delete from _vt.copy_state"
external_connector_test.go:121: query:
"update _vt.vreplication set pos='MySQL56/84926b08-9719-11ea-bd31-34e12d1e6711:1-37', time_updated=1589594650, transaction_timestamp=1589594648, message='' where id=3", does not match query 5:
"/update _vt.vreplication set state='Running'"