Fix exec permission in devops-stages/stage-lint.sh

Change-Id: Id3212b2e03014acf9bbe854b97ac6ff0c839a5f0
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/devops-stages/stage-lint.sh b/devops-stages/stage-lint.sh
old mode 100644
new mode 100755