TestLogs checks how ContainerLogs returns stdout and stderr for tty
and non-tty containers. Network connectivity is not part of that
contract, but every case currently starts on the default network.
In the Windows the test is sometimes flaky and the failing starts
report:
```
hcs::CreateComputeSystem ... The parameter is incorrect.
```
That HCS error is not specific enough to prove the exact failing
subsystem.
The surrounding daemon log, however, shows default NAT endpoint
allocation, service-record updates, and endpoint teardown around those
starts, all while several short-lived log-test containers run in
parallel.
Use network mode none so this log-streaming test no longer depends on
Windows default-network endpoint setup.
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>