classes/oeqa: Update for print statements and file() -> open() for python3

Found some more syntax cleanups needed for python3.

(From OE-Core rev: 1181d86e8707c5b8e8d43d5e785d7d9cf01fa491)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/oelint.bbclass

@@ -45,7 +45,7 @@ python do_lint() {
 
     def findKey(path, key):
         ret = True
-        f = file('%s' % path, mode = 'r')
+        f = open('%s' % path, mode = 'r')
         line = f.readline()
         while line:
             if line.find(key) != -1: