Remove env erase from runTest

- Env erase shouldn't be part of runTest because it erases
envs between stages and so that all starts from scratch.
- Env erase moved to separate function

Change-Id: I49ed4ca05606486f5d4955d99cfa4e42f6cd9663
diff --git a/src/com/mirantis/mcp_qa/EnvActions.groovy b/src/com/mirantis/mcp_qa/EnvActions.groovy
index d95c411..4df4f64 100644
--- a/src/com/mirantis/mcp_qa/EnvActions.groovy
+++ b/src/com/mirantis/mcp_qa/EnvActions.groovy
@@ -32,3 +32,14 @@
         '''
     }
 }
+
+/**
+ * Erase running environment
+ */
+def eraseEnv() {
+        sh '''
+            . ${VENV_PATH}/bin/activate
+            dos.py erase ${ENV_NAME} || true
+        '''
+}
+