Create ICANN report upload action

This is the first step in moving the current []cron-Python reporting scripts
into App Engine, as an official part of the Nomulus package. This copies the
structure of RDE uploads, with a few changes specific to monthly reporting.

I've left some TODOs related to actually testing it on the ICANN endpoint, as we're still not sure how files to be uploaded will be staged, and whether we can actually ping their endpoint on valid ports (80 or 443).

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=160408703

java/google/registry/config/RegistryConfigSettings.java

@@ -26,6 +26,7 @@ public class RegistryConfigSettings {
   public RegistryPolicy registryPolicy;
   public Datastore datastore;
   public Caching caching;
+  public IcannReporting icannReporting;
   public Rde rde;
   public RegistrarConsole registrarConsole;
   public Monitoring monitoring;
@@ -102,6 +103,12 @@ public class RegistryConfigSettings {
     public int staticPremiumListMaxCachedEntries;
   }
 
+  /** Configuration for ICANN monthly reporting. */
+  public static class IcannReporting {
+    public String icannTransactionsReportingUploadUrl;
+    public String icannActivityReportingUploadUrl;
+  }
+
   /** Configuration for Registry Data Escrow (RDE). */
   public static class Rde {
     public String reportUrlPrefix;