Adding Jenkins branch parameter.

Signed-off-by: Boris Djalal <boris.djalal@eurecom.fr>

ci-scripts/test-boris-Jenkinsfile

@@ -84,7 +84,7 @@ pipeline {
         stage ('Retrieve latest from branch') {
             steps {
 	        script {
-	            checkout([$class: 'GitSCM', branches: [[name: '*/gNB-nrUE-USRP']], doGenerateSubmoduleConfigurations: false, extensions: [], submoduleCfg: [], userRemoteConfigs: [[url: 'https://gitlab.eurecom.fr/oai/openairinterface5g.git']]])
+	            checkout([$class: 'GitSCM', branches: [[name: "${params.Branch}"]], doGenerateSubmoduleConfigurations: false, extensions: [], submoduleCfg: [], userRemoteConfigs: [[url: 'https://gitlab.eurecom.fr/oai/openairinterface5g.git']]])
 	            sh "git clean -x -d -ff"
 	            sh "git log -n1"
 	        }