Make _create_loginable_secgroup_rule non-private

_create_loginable_secgroup_rule() is currently private
which is not necessarily required to be private

Implements: blueprint tempest-scenario-manager-stable
Signed-off by: Soniya Vyas<svyas@redhat.com>

Change-Id: Ice42441874bdbc8f58eb2a07320eb484b8780502
diff --git a/releasenotes/notes/create_loginable_secgroup_rule-73722fd4b4eb12d0.yaml b/releasenotes/notes/create_loginable_secgroup_rule-73722fd4b4eb12d0.yaml
new file mode 100644
index 0000000..e53411d
--- /dev/null
+++ b/releasenotes/notes/create_loginable_secgroup_rule-73722fd4b4eb12d0.yaml
@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Added public interface create_loginable_secgroup_rule().
+    Since this interface is meant to be used by tempest plugins,
+    It doesn't neccessarily require to be private api.