Improve parallelism of testing jobs

Stop triggering jobs in wave and use throttle concurrent
build plugin instead

Change-Id: If6eb216184da03cf918108d3e90f646bb41feed1
diff --git a/test-salt-models-pipeline.groovy b/test-salt-models-pipeline.groovy
index 2ff76d2..7099954 100644
--- a/test-salt-models-pipeline.groovy
+++ b/test-salt-models-pipeline.groovy
@@ -82,7 +82,6 @@
       if(checkouted) {
         def infraYMLs = sh(script: "find ./classes/ -regex '.*cluster/[-_a-zA-Z0-9]*/[infra/]*init\\.yml' -exec grep -il 'cluster_name' {} \\;", returnStdout: true).tokenize()
         def branches = [:]
-        def acc = 0
         for (int i = 0; i < infraYMLs.size(); i++) {
           def infraYMLConfig = readYaml(file: infraYMLs[i])
           if(!infraYMLConfig["parameters"].containsKey("_param")){
@@ -98,11 +97,6 @@
           def clusterDomain = infraParams["cluster_domain"]
           def configHostname = infraParams["infra_config_hostname"]
           def testTarget = String.format("%s.%s", configHostname, clusterDomain)
-          if (acc >= PARALLEL_NODE_GROUP_SIZE.toInteger()) {
-            parallel branches
-            branches = [:]
-            acc = 0
-          }
 
           branches[testTarget] = {
             build job: "test-salt-model-node", parameters: [
@@ -118,11 +112,8 @@
               [$class: 'StringParameterValue', name: 'MAX_CPU_PER_JOB', value: MAX_CPU_PER_JOB],
               [$class: 'StringParameterValue', name: 'SYSTEM_GIT_REF', value: SYSTEM_GIT_REF]
             ]}
-          acc++;
         }
-        if (acc != 0) {
-          parallel branches
-        }
+        parallel branches
       }
     }
   } catch (Throwable e) {