For the sub test TestKVDelete/ClientAutoTLS, the timeout might be caused
by IO or task scheduled. It's really hard to reproduce this case. And
we don't add `VERBOSE=1` for e2e test, the pipeline doesn't show the
`EXPECT_DEBUG` log in time. It's also hard to debug when flaky case
show. So, this patch will enable `VERBOSE=1` to get timestamp in time.
And the one operation `del a c -w json` will be performed after two seconds
delay, we can increase the timeout from 15s to 30s just in case that the
put or del operations take more time in unstable env.
```
Warning: Keys between "a" and "c" will be deleted. Please interrupt the
command within next 2 seconds to cancel.
```
Signed-off-by: Wei Fu <fuweid89@gmail.com>
befb283cca