Merge pull request #2511 from UtahDave/develop

use format instead of string join.

salt/modules/apt.py

@@ -71,7 +71,7 @@ def version(name):
         salt '*' pkg.version <package name>
     '''
     # check for :i386 appended to 32bit name installed on 64bit machine
-    name32bit = ''.join([name, ':i386'])
+    name32bit = '{0}:i386'.format(name)
 
     pkgs = list_pkgs(name)
     if name in pkgs: