s/get_vlan_id_from_name/get_vlan_id_by_name/

Change-Id: I53698ec756414e2c0bae9e4db48278697195eced
diff --git a/db/db.py b/db/db.py
index 1d20748..571ffa7 100644
--- a/db/db.py
+++ b/db/db.py
@@ -107,7 +107,7 @@
     # Names and tags must be unique
     def create_vlan(self, name, tag, is_base_vlan):
 
-        vlan_id = self.get_vlan_id_from_name(name)
+        vlan_id = self.get_vlan_id_by_name(name)
         if vlan_id is not None:
             raise InputError("VLAN name %s is already in use" % name)
 
@@ -270,7 +270,7 @@
     def get_port_id(self, name):
         return self._get_element("port_id", "port", "name", name)
 
-    def get_vlan_id_from_name(self, name):
+    def get_vlan_id_by_name(self, name):
         return self._get_element("vlan_id", "vlan", "name", name)
 
     def get_vlan_id_from_tag(self, tag):