fix mae packaging

debian/castor-mae.dirs

 var/log/castor
-etc/mae/metrics

debian/castor-mae.install.perm

 %attr(0755,root,root) var/www/castormon/*
-%attr(0755,root,root) usr/bin/mae.py
+%attr(0755,root,root) usr/bin/mae-consumer.py
 %attr(0755,root,root) usr/lib/python*/site-packages/mae/*
 %attr(0644,root,root) etc/mae/mae.conf.example
 %attr(0644,root,root) etc/logrotate.d/castor-mae