Adding function to delete cache for a given addr

Adding _deleteCache: deletes the cache for given address (useful for dev purposes or to recalculate caches)

lib/services/address/index.js

@@ -495,6 +495,17 @@ AddressService.prototype._loadCache = function(address, result, useCache, next)
   });
 }
 
+AddressService.prototype._deleteCache = function(address, callback) {
+  const self = this;
+  var key = self._encoding.encodeAddressCacheKey(address);
+
+  if(!_.isFunction(callback)) //if callback is not passed, call a empty function
+    callback = () => null;
+
+    self._db.del(key, callback);
+
+}
+
 AddressService.prototype._setOutputResults = function(tx, address, result) {
 
   for(var j = 0; j < tx.outputs.length; j++) {