test: Fix outdated rego rules (#741)

Author: sbernauer

docs/modules/opa/pages/usage-guide/policies.adoc

@@ -21,11 +21,11 @@ data:
   test.rego: | # <2>
     package test
 
-    hello {
+    hello if {
       true
     }
 
-    world {
+    world if {
       false
     }
 ----

tests/templates/kuttl/logging/03-install-opa.yaml.j2

@@ -9,11 +9,11 @@ data:
   test.rego: |
     package test
 
-    hello {
+    hello if {
       true
     }
 
-    world {
+    world if {
       false
     }
 ---

tests/templates/kuttl/smoke/10-install-opa.yaml.j2

@@ -9,8 +9,6 @@ data:
   test.rego: |
     package test
 
-    import rego.v1
-
     hello if {
       true
     }