Deprecate redundant defined type

The murano::application defined type is just a wrapper of
the murano_application resource type and does not contain quite useful
logic. We can deprecate the defined type and let users us the raw
resource type instead.

Change-Id: I63e90ce95c80f4f2f39ead858996e0545bb1f2c7

manifests/application.pp

@@ -37,6 +37,9 @@ define murano::application (
 
   include murano::deps
 
+  warning("The murano::application defined type is deprecated. \
+Use the murano_application resource type instead.")
+
   $package_path="/var/cache/murano/meta/${package_name}.zip"
 
   murano_application { $package_name:

releasenotes/notes/deprecate-murano-application-cadb1c2716942a9e.yaml

@@ -0,0 +1,6 @@
+---
+deprecations:
+  - |
+    The ``murano::application`` defined resource type has been deprecated and
+    will be removed in a future release. Use the ``murano_application``
+    resource type instead.