small refactoring of configure.file

however i wasnt able to pass watchdog selfcheck:

```sh
tehnerd@tehnerd-test2-devbox5:~/exabgp$ ./dev/bin/selfcheck 
ok     /home/tehnerd/exabgp/dev/runtest/api-add-remove.conf
ok     /home/tehnerd/exabgp/dev/runtest/api-announcement.conf
ok     /home/tehnerd/exabgp/dev/runtest/api-fast.conf
ok     /home/tehnerd/exabgp/dev/runtest/api-flow.conf
ok     /home/tehnerd/exabgp/dev/runtest/api-multi-neighbor.conf
ok     /home/tehnerd/exabgp/dev/runtest/api-multisession.conf
ok     /home/tehnerd/exabgp/dev/runtest/api-nexthop-self.conf
ok     /home/tehnerd/exabgp/dev/runtest/api-teardown.conf
ok     /home/tehnerd/exabgp/dev/runtest/api-vpnv4.conf
ok     /home/tehnerd/exabgp/dev/runtest/flow.conf
ok     /home/tehnerd/exabgp/dev/runtest/generic-attribute.conf
ok     /home/tehnerd/exabgp/dev/runtest/group.conf
ok     /home/tehnerd/exabgp/dev/runtest/ipv46routes4family.conf
ok     /home/tehnerd/exabgp/dev/runtest/ipv46routes6family.conf
ok     /home/tehnerd/exabgp/dev/runtest/parity.conf
ok     /home/tehnerd/exabgp/dev/runtest/path-information.conf
ok     /home/tehnerd/exabgp/dev/runtest/skip.conf
failed /home/tehnerd/exabgp/dev/runtest/watchdog.conf
```


```sh
Wed, 18 Jun 2014 16:06:47 | ERROR    | 12509  | configuration | Problem with the configuration file, no change done
Wed, 18 Jun 2014 16:06:47 | ERROR    | 12509  | configuration | 
Wed, 18 Jun 2014 16:06:47 | ERROR    | 12509  | configuration | syntax error in section static
Wed, 18 Jun 2014 16:06:47 | ERROR    | 12509  | configuration | line 15 : route 77.77.77.77 next-hop 1.2.3.4 watchdog dnsr withdraw ;
Wed, 18 Jun 2014 16:06:47 | ERROR    | 12509  | configuration | 
Wed, 18 Jun 2014 16:06:47 | ERROR    | 12509  | configuration | 
```