Infinity timeout, just like all the others :(

This is a cherry-pick of:

https://github.com/cloudant/couch_replicator/commit/e947b392db1eb2de22aac4a4fa12da118fe114b3
diff --git a/src/couch_replicator_manager.erl b/src/couch_replicator_manager.erl
index b74ba41..972d8ed 100644
--- a/src/couch_replicator_manager.erl
+++ b/src/couch_replicator_manager.erl
@@ -134,7 +134,7 @@
 continue(#rep{doc_id = null}) ->
     {true, no_owner};
 continue(#rep{id = RepId}) ->
-    Owner = gen_server:call(?MODULE, {owner, RepId}),
+    Owner = gen_server:call(?MODULE, {owner, RepId}, infinity),
     {node() == Owner, Owner}.