Clean up artifacts directory before test

Change-Id: I8c09de8069d3a9d14af31a10dab6075dd4f0dea8
diff --git a/cvp-func.groovy b/cvp-func.groovy
index ef50945..d1fff1a 100644
--- a/cvp-func.groovy
+++ b/cvp-func.groovy
@@ -33,6 +33,7 @@
             saltMaster = salt.connection(SALT_MASTER_URL, SALT_MASTER_CREDENTIALS)
             validate.runBasicContainer(saltMaster, TARGET_NODE, TEST_IMAGE)
             sh "rm -rf ${artifacts_dir}"
+            salt.cmdRun(saltMaster, TARGET_NODE, "rm -rf ${remote_artifacts_dir}")
             salt.cmdRun(saltMaster, TARGET_NODE, "mkdir -p ${remote_artifacts_dir}")
             validate.configureContainer(saltMaster, TARGET_NODE, PROXY, TOOLS_REPO, TEMPEST_REPO, TEMPEST_ENDPOINT_TYPE)
         }