Added a new method to create signature files.

This method is a wrapper to the signature script which is available at
slapos.libnetworkcache.git.

We should provide this method to be able to create the files required
during the test of signature feature on network.txt doctest.

src/zc/buildout/testing.py

@@ -361,6 +361,15 @@ def buildoutSetUp(test):
         register_teardown(lambda: stop_server(url, thread))
         return url
 
+    def create_signature_file_list(path,
+                                   private_key_file='private.pem',
+                                   certificate_file='public.pem'):
+        from slapos.signature import createPrivateKeyAndCertificateFile
+        private_key_file = os.path.join(path, private_key_file)
+        certificate_file = os.path.join(path, certificate_file)
+        createPrivateKeyAndCertificateFile(certificate_file, private_key_file)
+        return certificate_file, private_key_file
+
     def make_py(initialization=''):
         """Returns paths to new executable and to its site-packages.
         """
@@ -425,6 +434,7 @@ def buildoutSetUp(test):
         bdist_egg = bdist_egg,
         start_server = start_server,
         start_nc = start_nc,
+        create_signature_file_list = create_signature_file_list,
         buildout = os.path.join(sample, 'bin', 'buildout'),
         wait_until = wait_until,
         make_py = make_py