ci(test-stage-template): remove deprecated variables

DOCKER_TLS_VERIFY and DOCKER_CERT_PATH are not set by default
in the currently used image versions

Changelog: None
Ticket: None
Signed-off-by: Alex Miliukov <oleksandr.miliukov@northern.tech>

gitlab-pipeline/stage/test.yml

@@ -181,9 +181,9 @@ test:backend-integration:azblob:enterprise:
   before_script:
     # Default value, will later be overwritten if successful
     - echo "failure" > /JOB_RESULT.txt
+
+    # Make sure docker interacts with dockerd via socket
     - unset DOCKER_HOST
-    - unset DOCKER_TLS_VERIFY
-    - unset DOCKER_CERT_PATH
 
     # Make sure the /dev/kvm device is readable and writable by everyone
     - chmod o+rw /dev/kvm