Set pull replication tests as large

The introduction of the graceful shutdown of the
replication queue has increased the overall elapsed
time of the tests.

Set the size to large so that the tests won't be
aborted in the middle.

Change-Id: Ibe27ac3c4ede6608f074f8437a0f93e838993ad9
diff --git a/BUILD b/BUILD
index da87d80..972f0d8 100644
--- a/BUILD
+++ b/BUILD
@@ -25,6 +25,7 @@
 
 junit_tests(
     name = "pull_replication_tests",
+    size = "large",
     srcs = glob([
         "src/test/java/**/*Test.java",
     ]),