Adapt tests to changed behavior in Gerrit core

Since change I2a57fe087 calling change owners are no longer added as
reviewer if they use the PostReview REST endpoint without voting.

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I597f23c9c9d0c91ff8e9323bbc07476267fbcf2d
diff --git a/src/test/java/com/googlesource/gerrit/plugins/reviewers/ReviewersIT.java b/src/test/java/com/googlesource/gerrit/plugins/reviewers/ReviewersIT.java
index e0dd539..619836a 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/reviewers/ReviewersIT.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/reviewers/ReviewersIT.java
@@ -84,8 +84,7 @@
     } while (reviewers == null);
 
     assertThat(reviewers.stream().map(a -> a._accountId).collect(toSet()))
-        .containsExactlyElementsIn(
-            ImmutableSet.of(admin.id().get(), user.id().get(), user2.id().get()));
+        .containsExactlyElementsIn(ImmutableSet.of(user.id().get(), user2.id().get()));
   }
 
   @Test
@@ -121,8 +120,7 @@
     } while (reviewers == null);
 
     assertThat(reviewers.stream().map(a -> a._accountId).collect(toSet()))
-        .containsExactlyElementsIn(
-            ImmutableSet.of(admin.id().get(), user.id().get(), user2.id().get()));
+        .containsExactlyElementsIn(ImmutableSet.of(user.id().get(), user2.id().get()));
   }
 
   @Test
@@ -189,6 +187,6 @@
     } while (reviewers == null && wait < 100);
 
     assertThat(reviewers.stream().map(a -> a._accountId).collect(toSet()))
-        .containsExactlyElementsIn(ImmutableSet.of(admin.id().get(), user.id().get()));
+        .containsExactlyElementsIn(ImmutableSet.of(user.id().get()));
   }
 }