New style: make source py2 & py3 compatible

- fix NameError: name 'unicode' is not defined
- fix SyntaxError: invalid syntax

cubicweb_trustedauth/authplugin.py

@@ -54,7 +54,7 @@ class XRemoteUserAuthentifier(native.BaseAuthentifier):
                 raise AuthenticationError('wrong user secret')
             rset = session.execute(self.auth_rql, {'login': clearlogin})
             return rset[0][0]
-        except Exception, exc:
+        except Exception as exc:
             session.debug('authentication failure (%s)', exc)
             pass
         raise AuthenticationError('user is not registered')

cubicweb_trustedauth/site_cubicweb.py

@@ -14,7 +14,7 @@
 # You should have received a copy of the GNU Lesser General Public License along
 # with this program. If not, see <http://www.gnu.org/licenses/>.
 
-_ = unicode
+from cubicweb import _
 
 options = (
     ('trustedauth-secret-key-file',

cubicweb_trustedauth/views.py

@@ -56,7 +56,7 @@ class XRemoteUserRetriever(authentication.WebAuthInfoRetriever):
             # need a multiple of 16 in length
             secret = cyphr.encrypt('%128s' % login)
             return login, {'secret': base64.encodestring(secret)}
-        except Exception, exc:
+        except Exception as exc:
             self.debug('web authenticator failed (%s)', exc)
             raise authentication.NoAuthInfo()