Explicitly point to legacy branch of industrial_ci

This is the most conservative approach, and allows us to switch to
master only when we explicitly decide to do so.

.gitlab-industrial-ci-kinetic-no-rosinstall.yml

@@ -19,7 +19,7 @@ before_script:
   stage: build
   before_script:
     - apk add --update bash coreutils tar
-    - git clone --quiet --depth 1 https://github.com/ros-industrial/industrial_ci.git .ci_config -b master
+    - git clone --quiet --depth 1 https://github.com/ros-industrial/industrial_ci.git .ci_config -b legacy
     - docker login ${ARTIFACT_DOCKER_URL} -u ${ARTIFACT_CI_USER} -p ${ARTIFACT_CI_TOKEN}
   script: .ci_config/gitlab.sh
   variables:

.gitlab-industrial-ci-kinetic-with-rosinstall.yml

@@ -19,7 +19,7 @@ before_script:
   stage: build
   before_script:
     - apk add --update bash coreutils tar
-    - git clone --quiet --depth 1 https://github.com/ros-industrial/industrial_ci.git .ci_config -b master
+    - git clone --quiet --depth 1 https://github.com/ros-industrial/industrial_ci.git .ci_config -b legacy
     - docker login ${ARTIFACT_DOCKER_URL} -u ${ARTIFACT_CI_USER} -p ${ARTIFACT_CI_TOKEN}
   script: .ci_config/gitlab.sh
   variables: