Replace `Tty` with `TTY` in all test case names so that we can run a bundle of `TTY` related test cases with TESTFLAGS like `-check.f TestExecTTY*` Signed-off-by: Zhang Wei <zhangwei555@huawei.com> Upstream-commit: e151ad936abecce944e3f7c285fa788c2dc1bba1 Component: engine