Added --rmdir flag to workspace remove

* tempest workspace remove --name command just remove the workspace
  entry from ~/.tempest/workspace.yaml and it does not deletes the
  workspace.

* by adding tempest workspace remove --name --rmdir removes
  the workspace as well as entry.

* renamed remove_workspace to remove_workspace_entry

Change-Id: I4528a23ca4933fdb7a3168f8dc99bbf0497ae5cc
diff --git a/releasenotes/notes/tempest-workspace-delete-directory-feature-74d6d157a5a05561.yaml b/releasenotes/notes/tempest-workspace-delete-directory-feature-74d6d157a5a05561.yaml
new file mode 100644
index 0000000..ec21098
--- /dev/null
+++ b/releasenotes/notes/tempest-workspace-delete-directory-feature-74d6d157a5a05561.yaml
@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Added tempest workspace remove --name <workspace_name> --rmdir
+    feature to delete the workspace directory as well as entry.