legion daemons

This adds ability to run daemon only on legion lord, all legion daemons are stopped/killed when local node is stopping. Hopefully I covered all cases

Example:

```
[uwsgi]

master = true
http = :8081
stats = :2101
wsgi-file = tests/staticfile.py

logdate = true

legion = legion1 225.1.1.1:19678 100 bf-cbc:abc
legion-node = legion1 225.1.1.1:19678

legion-attach-daemon = legion1 memcached -p 10001

legion-smart-attach-daemon = legion1 /tmp/memcached.pid memcached -p 10002 -d -P /tmp/memcached.pid
```