Run unit tests in a container with no .docker/config mount

Signed-off-by: aiordache <anca.iordache@docker.com>

Jenkinsfile

@@ -85,6 +85,13 @@ def runTests = { Map settings ->
         def testNetwork = "dpy-testnet-\$BUILD_NUMBER-\$EXECUTOR_NUMBER-${pythonVersion}-${dockerVersion}"
         withDockerRegistry(credentialsId:'dockerbuildbot-index.docker.io') {
           try {
+            // unit tests
+            sh """docker run --rm \\
+              -e 'DOCKER_TEST_API_VERSION=${apiVersion}' \\
+              ${testImage} \\
+              py.test -v -rxs --cov=docker tests/unit
+            """
+            // integration tests
             sh """docker network create ${testNetwork}"""
             sh """docker run --rm -d --name ${dindContainerName} -v /tmp --privileged --network ${testNetwork} \\
               ${imageDindSSH} dockerd -H tcp://0.0.0.0:2375
@@ -97,7 +104,7 @@ def runTests = { Map settings ->
               --volumes-from ${dindContainerName} \\
               -v $DOCKER_CONFIG/config.json:/root/.docker/config.json \\
               ${testImage} \\
-              py.test -v -rxs --cov=docker --ignore=tests/ssh tests/
+              py.test -v -rxs --cov=docker tests/integration
             """
             sh """docker stop ${dindContainerName}"""
             // start DIND container with SSH