CI: fix when slave jobs fails, email status is SUCCESS.

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

ci-scripts/Jenkinsfile-gitlab

@@ -433,6 +433,11 @@ pipeline {
                                 }
                             }
                         }
+                        failure {
+                            script {
+                                currentBuild.result = 'FAILURE'
+                            }
+                        }
                     }
                 }
                 stage ("Test TDD - Band 40 - B210") {
@@ -479,6 +484,11 @@ pipeline {
                                 }
                             }
                         }
+                        failure {
+                            script {
+                                currentBuild.result = 'FAILURE'
+                            }
+                        }
                     }
                 }
                 stage ("Test IF4p5 - FDD - Band 7 - B210") {
@@ -525,6 +535,11 @@ pipeline {
                                 }
                             }
                         }
+                        failure {
+                            script {
+                                currentBuild.result = 'FAILURE'
+                            }
+                        }
                     }
                 }
                 stage ("Test IF4p5 - TDD - Band 40 - B210") {
@@ -571,6 +586,11 @@ pipeline {
                                 }
                             }
                         }
+                        failure {
+                            script {
+                                currentBuild.result = 'FAILURE'
+                            }
+                        }
                     }
                 }
             }