Dont fetch/process deposits until the CCTS has cleared its suspended …

…transfers (stratisproject#367)

* Update MaturedBlocksSyncManager.cs

* Fix Test

src/Stratis.Features.FederatedPeg/TargetChain/MaturedBlocksSyncManager.cs

@@ -76,6 +76,12 @@ public async Task StartAsync()
         /// <returns><c>true</c> if delay between next time we should ask for blocks is required; <c>false</c> otherwise.</returns>
         protected async Task<bool> SyncDepositsAsync()
         {
+            if (this.crossChainTransferStore.HasSuspended())
+            {
+                this.logger.LogInformation("Deposits will not be fetched until the cross chain transfer store has cleared it's suspended transfers.");
+                return true;
+            }
+
             SerializableResult<List<MaturedBlockDepositsModel>> model = await this.federationGatewayClient.GetMaturedBlockDepositsAsync(this.crossChainTransferStore.NextMatureDepositHeight, this.nodeLifetime.ApplicationStopping).ConfigureAwait(false);
 
             if (model == null)