Refactored all pipelines branches to external soft param

Change-Id: I3e451815029227f287aa1575099b0cd25b72433d
diff --git a/jenkins/client/job/opencontrail/build/dpdk-extra.yml b/jenkins/client/job/opencontrail/build/dpdk-extra.yml
index 0a152f1..2d4e4d8 100644
--- a/jenkins/client/job/opencontrail/build/dpdk-extra.yml
+++ b/jenkins/client/job/opencontrail/build/dpdk-extra.yml
@@ -54,6 +54,7 @@
             scm:
               type: git
               url: "${_param:jenkins_gerrit_url}/mk/mk-pipelines"
+              branch: "${_param:jenkins_pipelines_branch}"
               credentials: "gerrit"
               script: build-extra-dpdk-pipeline.groovy
             quiet_period: 120
diff --git a/jenkins/client/job/opencontrail/git-mirrors/2way.yml b/jenkins/client/job/opencontrail/git-mirrors/2way.yml
index 38d64c3..49ae2be 100644
--- a/jenkins/client/job/opencontrail/git-mirrors/2way.yml
+++ b/jenkins/client/job/opencontrail/git-mirrors/2way.yml
@@ -20,6 +20,7 @@
             scm:
               type: git
               url: "${_param:jenkins_gerrit_url}/mk/mk-pipelines"
+              branch: "${_param:jenkins_pipelines_branch}"
               credentials: "gerrit"
               script: git-mirror-2way-pipeline.groovy
               github:
diff --git a/jenkins/client/job/opencontrail/git-mirrors/downstream.yml b/jenkins/client/job/opencontrail/git-mirrors/downstream.yml
index 45b06b6..f92d1a7 100644
--- a/jenkins/client/job/opencontrail/git-mirrors/downstream.yml
+++ b/jenkins/client/job/opencontrail/git-mirrors/downstream.yml
@@ -58,6 +58,7 @@
             scm:
               type: git
               url: "${_param:jenkins_gerrit_url}/mk/mk-pipelines"
+              branch: "${_param:jenkins_pipelines_branch}"
               credentials: "gerrit"
               script: git-mirror-pipeline.groovy
               github:
@@ -91,6 +92,7 @@
           scm:
             type: git
             url: "${_param:jenkins_gerrit_url}/mk/mk-pipelines"
+            branch: "${_param:jenkins_pipelines_branch}"
             credentials: "gerrit"
             script: git-mirror-pipeline.groovy
             github:
diff --git a/jenkins/client/job/opencontrail/git-mirrors/upstream.yml b/jenkins/client/job/opencontrail/git-mirrors/upstream.yml
index fa9bc5b..af4c6ac 100644
--- a/jenkins/client/job/opencontrail/git-mirrors/upstream.yml
+++ b/jenkins/client/job/opencontrail/git-mirrors/upstream.yml
@@ -57,6 +57,7 @@
             scm:
               type: git
               url: "${_param:jenkins_gerrit_url}/mk/mk-pipelines"
+              branch: "${_param:jenkins_pipelines_branch}"
               credentials: "gerrit"
               script: git-mirror-pipeline.groovy
               github:
@@ -100,6 +101,7 @@
           scm:
             type: git
             url: "${_param:jenkins_gerrit_url}/mk/mk-pipelines"
+            branch: "${_param:jenkins_pipelines_branch}"
             credentials: "gerrit"
             script: git-mirror-pipeline.groovy
             github:
@@ -130,6 +132,7 @@
           scm:
             type: git
             url: "${_param:jenkins_gerrit_url}/mk/mk-pipelines"
+            branch: "${_param:jenkins_pipelines_branch}"
             credentials: "gerrit"
             script: git-mirror-pipeline.groovy
             github:
@@ -171,6 +174,7 @@
           scm:
             type: git
             url: "${_param:jenkins_gerrit_url}/mk/mk-pipelines"
+            branch: "${_param:jenkins_pipelines_branch}"
             credentials: "gerrit"
             script: git-mirror-pipeline.groovy
             github: