fix: Have consistent spacing for /release_setup.sh (#23)

* If the environment is provided by a Linux container's
  /release_setup.sh ensure that it has the same spacing in the setup
  information printed to screen as other environments.

Author: matthewfeickert

cvmfs-venv.sh

@@ -125,6 +125,7 @@ if [ ! -z "${_setup_command}" ]; then
 elif [ -f "/release_setup.sh" ]; then
     echo "WARNING: /release_setup.sh exists and it is assumed you are in a Linux container."
     echo "         Setting up environment with '. /release_setup.sh'."
+    printf "\n. /release_setup.sh\n"
     . /release_setup.sh
 fi