Reorg sample policies dir

This is an initial step of reorganizing the sample specs of policies.

Change-Id: I6b67088c21bc0dfe3ddc0cdb3d2dfac0819a10d0

examples/policies/deletion_policy.yaml

@@ -0,0 +1,19 @@
+# Sample deletion policy that can be attached to a cluster.
+type: senlin.policy.deletion
+version: 1.0
+description: A policy for choosing victim node(s) from a cluster for deletion.
+properties:
+  # The valid values include:
+  # OLDEST_FIRST, OLDEST_PROFILE_FIRST, YOUNGEST_FIRST, RANDOM
+  criteria: OLDEST_FIRST
+
+  # Whether deleted node should be destroyed 
+  destroy_after_deletion: True
+
+  # Length in number of seconds before the actual deletion happens
+  # This param buys an instance some time before deletion
+  grace_period: 60
+
+  # Whether the deletion will reduce the desired capability of
+  # the cluster as well.
+  reduce_desired_capacity: False