TT#29452 Convert 'sipwise-base-dist-test' docker to stretch

Change-Id: If8a6f67601d22403dd276dbd62a82249061c1dac

t/Dockerfile

@@ -1,5 +1,5 @@
-# DOCKER_NAME=sipwise-base-jessie
-FROM docker.mgm.sipwise.com/sipwise-jessie:latest
+# DOCKER_NAME=sipwise-base-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
@@ -20,13 +20,13 @@ WORKDIR /code/
 # (jump to the next section if you don't want to build yourself!):
 #
 # NOTE: run the following command from root folder of git repository:
-# % docker build --tag="sipwise-base-jessie" -f ./t/Dockerfile .
-# % docker run --rm -i -t -v $(pwd):/code:rw sipwise-base-jessie:latest bash
+# % docker build --tag="sipwise-base-stretch" -f ./t/Dockerfile .
+# % docker run --rm -i -t -v $(pwd):/code:rw sipwise-base-stretch:latest bash
 #
 # Use the existing docker image:
-# % docker pull docker.mgm.sipwise.com/sipwise-base-jessie
+# % docker pull docker.mgm.sipwise.com/sipwise-base-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/sipwise-base-jessie:latest bash
+# % docker run --rm -i -t -v $(pwd):/code:rw docker.mgm.sipwise.com/sipwise-base-stretch:latest bash
 #
 # Inside docker:
 #   cd /code && ./t/testrunner