Add rego.v1 import to rego files

Author: garryod

org-policy/test.rego

@@ -1,6 +1,6 @@
 package diamond.policy
 
-import future.keywords
+import rego.v1
 
 # METADATA
 # description: 'hello_world only if {"hello": "world"}'

org-policy/test_test.rego

@@ -1,7 +1,7 @@
 package diamond.policy_test
 
 import data.diamond.policy
-import future.keywords
+import rego.v1
 
 # Recommended pattern for naming:
 # Tests for foo.rego are stored in foo_test.rego