minor fixes to siab-test pipeline

Change-Id: I427d818d91e6ffdce70767381e873d33beaf8ebb
diff --git a/jjb/pipeline/siab-test.groovy b/jjb/pipeline/siab-test.groovy
index 7994bf6..4a5cac0 100644
--- a/jjb/pipeline/siab-test.groovy
+++ b/jjb/pipeline/siab-test.groovy
@@ -11,7 +11,7 @@
 
     stage ("Clean workspace") {
       steps {
-            sh 'rm -rf *'
+            sh 'cd $WORKSPACE; rm -rf *'
           }
         }
 
@@ -20,8 +20,8 @@
         checkout(changelog: false, \
           poll: false,
           scm: [$class: 'RepoScm', \
-            manifestRepositoryUrl: "${params.manifestUrl}", \
-            manifestBranch: "${params.manifestBranch}", \
+            manifestRepositoryUrl: "https://gerrit.opencord.org/manifest.git", \
+            manifestBranch: "master", \
             currentBranch: true, \
             destinationDir: 'cord', \
             forceSync: true,