Wip/martyn/u boot installer

Jenkinsfile

@@ -613,8 +613,8 @@ buildCandidates.each { name, arch ->
 }
 
 println("buildOnlyList:")
-println(buildOnlyList)
-if (buildOnlyList.containsValue("installers")) {
+println(buildOnlyList.keySet())
+if (buildOnlyList.keySet().containsValue("installers")) {
   /* Add installer */
   first_pass << [("$name $type"):
       buildInstallers(installers)