Add python3 support

company.py

@@ -35,7 +35,7 @@ class Company:
 
     @classmethod
     def get_private_key(cls, companies, name=None):
-        converter = buffer
+        converter = bytes
         default = None
         format_ = Transaction().context.pop(
             '%s.%s' % (cls.__name__, name), '')

load_pkcs12.py

@@ -58,7 +58,7 @@ class LoadPKCS12(Wizard):
         (company,) = Company.browse([company_id])
         with BytesIO(self.start.pfx) as pfx:
             try:
-                pkcs12 = load_pkcs12(pfx.read(), bytes(self.start.password))
+                pkcs12 = load_pkcs12(pfx.read(), self.start.password)
                 crt = dump_certificate(FILETYPE_PEM, pkcs12.get_certificate())
                 key = dump_privatekey(FILETYPE_PEM, pkcs12.get_privatekey())
                 Company.write([company], {