Give core registry libraries public visibility

This is so Donuts can create entirely separate Bazel repositories that
link against the Domain Registry codebase.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=116182448

java/com/google/domain/registry/request/BUILD

@@ -7,6 +7,7 @@ java_library(
         ["*.java"],
         exclude = ["Modules.java"],
     ),
+    visibility = ["//visibility:public"],
     deps = [
         "//java/com/google/common/annotations",
         "//java/com/google/common/base",
@@ -30,6 +31,7 @@ java_library(
 java_library(
     name = "modules",
     srcs = ["Modules.java"],
+    visibility = ["//visibility:public"],
     deps = [
         ":request",
         "//java/com/google/api/client/extensions/appengine/http",