hack/boilerplate: added regex to strip Python shebang

Fixes Prow Build Error:
Boilerplate header is wrong for: /home/prow/go/src/k8s.io/kubernetes/hack/update_owners.py

Signed-off-by: James McClune <jmcclune@mcclunetechnologies.net>

hack/boilerplate/boilerplate.py

@@ -99,7 +99,7 @@ def file_passes(filename, refs, regexs):
     if extension == "go" or extension == "generatego":
         p = regexs["go_build_constraints"]
         (data, found) = p.subn("", data, 1)
-    elif extension == "sh":
+    elif extension in ["sh", "py"]:
         p = regexs["shebang"]
         (data, found) = p.subn("", data, 1)
 
@@ -205,7 +205,7 @@ def get_regexs():
     regexs["date"] = re.compile(get_dates())
     # strip // +build \n\n build constraints
     regexs["go_build_constraints"] = re.compile(r"^(// \+build.*\n)+\n", re.MULTILINE)
-    # strip #!.* from shell scripts
+    # strip #!.* from scripts
     regexs["shebang"] = re.compile(r"^(#!.*\n)\n*", re.MULTILINE)
     # Search for generated files
     regexs["generated"] = re.compile( 'DO NOT EDIT' )

hack/boilerplate/boilerplate.py.txt

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 # Copyright YEAR The Kubernetes Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");