add some missing imports that caused the tests to pass but breaks oauth (#108)

diff --git a/api-gateway-config/scripts/lua/oauth/github.lua b/api-gateway-config/scripts/lua/oauth/github.lua
index 5c0bd9e..019aa56 100644
--- a/api-gateway-config/scripts/lua/oauth/github.lua
+++ b/api-gateway-config/scripts/lua/oauth/github.lua
@@ -31,6 +31,7 @@
     },
     ssl_verify = false
   }
+  local utils = require "lib/utils"
   local request_uri = utils.concatStrings({"https://", "api.github.com", "/user?access_token=", token})
   local res, err = httpc:request_uri(request_uri, request_options)
 -- convert response
diff --git a/api-gateway-config/scripts/lua/oauth/google.lua b/api-gateway-config/scripts/lua/oauth/google.lua
index 2bc6c95..d8cc9b2 100644
--- a/api-gateway-config/scripts/lua/oauth/google.lua
+++ b/api-gateway-config/scripts/lua/oauth/google.lua
@@ -24,6 +24,7 @@
   local cjson = require "cjson"
   local http = require "resty.http"
   local request = require "lib/request"
+  local utils = require "lib/utils"
   local httpc = http.new()
 
   local request_options = {