TT#21905 Switch data-hal Dockerfile to Debian stretch

Change-Id: If204fe7d28b720843e6a39dc8c82ac87170f7a63

t/Dockerfile

@@ -1,11 +1,11 @@
-# DOCKER_NAME=data-hal-jessie
-FROM docker.mgm.sipwise.com/sipwise-jessie:latest
+# DOCKER_NAME=data-hal-stretch
+FROM docker.mgm.sipwise.com/sipwise-stretch:latest
 
 # Important! Update this no-op ENV variable when this Dockerfile
 # is updated with the current date. It will force refresh of all
 # of the base images and things like `apt-get update` won't be using
 # old cached versions when the Dockerfile is built.
-ENV REFRESHED_AT 2017-07-18
+ENV REFRESHED_AT 2017-09-19
 
 # files that get-code generates
 COPY t/sources.list.d/builddeps.list /etc/apt/sources.list.d/
@@ -49,17 +49,17 @@ WORKDIR /code/
 #
 # you need to put the proper NGCP sources at t/sources.list.d/builddeps.list
 # for instance, trunk:
-# echo "deb https://deb.sipwise.com/autobuild/ release-trunk-jessie main" > /
+# echo "deb https://deb.sipwise.com/autobuild/ release-trunk-stretch main" > /
 #  t/sources.list.d/builddeps.list
 #
 # NOTE: run the following command from root folder of git repository:
-# % docker build --tag="data-hal-jessie" -f t/Dockerfile .
-# % docker run --rm -i -t -v $(pwd):/code:rw data-hal-jessie:latest bash
+# % docker build --tag="data-hal-stretch" -f t/Dockerfile .
+# % docker run --rm -i -t -v $(pwd):/code:rw data-hal-stretch:latest bash
 #
 # Use the existing docker image:
-# % docker pull docker.mgm.sipwise.com/data-hal-jessie
+# % docker pull docker.mgm.sipwise.com/data-hal-stretch
 # NOTE: run the following command from root folder of git repository:
-# % docker run --rm -i -t -v $(pwd):/code:rw docker.mgm.sipwise.com/data-hal-jessie:latest bash
+# % docker run --rm -i -t -v $(pwd):/code:rw docker.mgm.sipwise.com/data-hal-stretch:latest bash
 #
 # Inside docker (the command is in history, just press UP button):
 #   ./t/testrunner