TestCliProxyDisableProxyUnixSock runs `docker info` by
clearing env however if the daemon is set up to run in a
different machine (e.g. Windows CI case) it does not make
use of DOCKER_TEST_HOST and tries to connect unix sock.
This fix injects DOCKER_HOST back to the test.
Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>
Upstream-commit: 029ca9829df1d42a67289e0318db416cdbcfaf35
Component: engine