Improve ncd status logging

Fixes #12.

In addition, restore the original formatting of ncd status line in `/var/log/ncm-cdispd` to avoid breaking existing parser for this file (I know that line is parsed to raise attention when a component failed).

Still work in progress, would like to add the list of failed components as described in #12.
so i wasn't aware of the state dir, but i just looked at the default on one of our nodes
```
[root@node2160 run]# ls -lrt /var/run/quattor-components/
total 4
-rw-r--r-- 1 root root 0 Jul 18 20:31 download
-rw-r--r-- 1 root root 1 Aug 27 10:57 spma
[root@node2160 run]# grep '' /var/run/quattor-components/
[root@node2160 run]# grep '' /var/run/quattor-components/*
/var/run/quattor-components/spma:
```
so this contains 2 files, one empty one and one with just a newline (not really useful); but they have very different timestamps. we should make sure that this dir is cleaned up etc etc; the documentations suggests it's only cleaned up when components become inactive, so we'd need some support of "recent" failures.