Add vault operations.

moto/glacier/utils.py

@@ -0,0 +1,14 @@
+from six.moves.urllib.parse import urlparse
+
+
+def region_from_glacier_url(url):
+    domain = urlparse(url).netloc
+
+    if '.' in domain:
+        return domain.split(".")[1]
+    else:
+        return 'us-east-1'
+
+
+def vault_from_glacier_url(full_url):
+    return full_url.split("/")[-1]