Jenkinsfile: Echo the branch you are building

Signed-off-by: Fisnik Hajredini <fhajredini@luxoft.com>
(cherry picked from commit f28fc5c)

scripts/Jenkinsfile

@@ -22,7 +22,7 @@ void buildBistro(String variant, String imageName) {
         // Initialize pelux-manifests to get the code
         sh "rm -rf pelux-manifests/"
         sh "git clone https://github.com/Pelagicore/pelux-manifests.git -b ${branchName}"
-
+        println("Using the specified branch for build: ${branchName}")
         dir('pelux-manifests') {
             def code = load "ci-scripts/yocto.groovy"
             String bistroPath = "${env.WORKSPACE}/${bistroDir}"
@@ -41,12 +41,12 @@ def variantList = []
 try {
     variantList = env.VARIANT_LIST.split()
     echo "Using the specified variant list for build"
-    println "[\"${variantList.join('", "')}\"]"
+    println ("Using the specified variant list for build: " + "[\"${variantList.join('", "')}\"]")
 } catch(e) {
     println("Using the default variant list for build. \nCaught error: " + e)
     variantList = ['intel-qtauto:core-image-pelux-qtauto-neptune-dev',
                     'rpi-qtauto:core-image-pelux-qtauto-neptune-dev']
-    println "[\"${variantList.join('", "')}\"]"
+    println ("[\"${variantList.join('", "')}\"]")
 }
 
 variantList.each {