Add command to re-save all environment entities

This is the tool we'll run after dumping everything in sandbox except
for Registrars, Registries, and RegistrarContacts, in order to
re-create the commit logs on said entities.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=119369873

java/com/google/domain/registry/tools/RegistryTool.java

@@ -62,6 +62,7 @@ public final class RegistryTool {
           .put("load_snapshot", LoadSnapshotCommand.class)
           .put("make_billing_tables", MakeBillingTablesCommand.class)
           .put("pending_escrow", PendingEscrowCommand.class)
+          .put("resave_environment_entities", ResaveEnvironmentEntitiesCommand.class)
           .put("send_escrow_report_to_icann", SendEscrowReportToIcannCommand.class)
           .put("update_application_status", UpdateApplicationStatusCommand.class)
           .put("update_claims_notice", UpdateClaimsNoticeCommand.class)