TestLongData fails do to changed MySQL server on Travis

[julienschmidt]

Issue description

An old test started to fail on Travis. It seems like we need to adjust innodb_log_file_size.

Error log

--- FAIL: TestLongData (0.37s)

	driver_test.go:155: error on exec [query too large to print]: Error 1118: The size of BLOB/TEXT data inserted in one transaction is greater than 10% of redo log size. Increase the redo log size using innodb_log_file_size.

[methane]

mysql/driver_test.go

Lines 975 to 978 in 5622634

	// don't get too ambitious
	if maxAllowedPacketSize > 1<<25 {
	maxAllowedPacketSize = 1 << 25
	}

Maybe, we should decrease this size.