Move restore from backend to tools

Move the "restoreCommitLogs" command from the backend module to the tools
module so it's easier to access with nomulus.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=156768389

java/google/registry/backup/BUILD

@@ -12,6 +12,7 @@ java_library(
         "//java/google/registry/cron",
         "//java/google/registry/model",
         "//java/google/registry/request",
+        "//java/google/registry/request/auth",
         "//java/google/registry/util",
         "//third_party/java/objectify:objectify-v4_1",
         "@com_google_appengine_api_1_0_sdk",