Move variable definition

ci-templates/industrial-ci-templates.yml

+variables:
+  GITLAB_TEMPLATES_BRANCH: master
+
 .industrial_ci:
   stage: build
   before_script:

ci-templates/syntax-check.yml

+variables:
+  GITLAB_TEMPLATES_BRANCH: master
+
 ##########################################################
 ## Check formating of C and C++ files using clang-format
 ##########################################################
-
 clang_format:
   stage: .post
   before_script:
@@ -13,7 +15,6 @@ clang_format:
     ROS_DISTRO: kinetic
     CLANG_FORMAT_CHECK: file
     CLANG_FORMAT_VERSION: "3.8"
-    GITLAB_TEMPLATES_BRANCH: master
   when: always
 
 ##########################################################
@@ -78,8 +79,6 @@ file_syntax:
 adoc_syntax:
   stage: .post
   image: tecnalia-docker-dev.artifact.tecnalia.com/alpine
-  variables:
-    GITLAB_TEMPLATES_BRANCH: master
   before_script:
     - apk add --update curl asciidoctor bash
   script: