[Test] Use dofile instead of require

require implies module loading via standard mechanism (which is have to present in LUA_PATH). Here we just load the specific files.

test/functional/lua/miltertest/combined.lua

@@ -1,7 +1,7 @@
 -- Combine tests
 
-require './lib'
-require './data'
+dofile './lib.lua'
+dofile './data.lua'
 
 setup()
 

test/functional/lua/miltertest/mt1.lua

@@ -1,7 +1,7 @@
 print('Check we will accept a message')
 
-require './lib'
-require './data'
+dofile './lib.lua'
+dofile './data.lua'
 
 setup()
 

test/functional/lua/miltertest/mt2.lua

@@ -1,7 +1,7 @@
 print('Check we will reject a message')
 
-require './lib'
-require './data'
+dofile './lib.lua'
+dofile './data.lua'
 
 setup()
 

test/functional/lua/miltertest/mt3.lua

@@ -1,7 +1,7 @@
 print('Check we will rewrite subjects')
 
-require './lib'
-require './data'
+dofile './lib.lua'
+dofile './data.lua'
 
 setup()
 

test/functional/lua/miltertest/mt4.lua

@@ -1,7 +1,7 @@
 print('Check we will defer messages')
 
-require './lib'
-require './data'
+dofile './lib.lua'
+dofile './data.lua'
 
 setup()