Issue215 ruby noexec wrapper fix

[issue215](https://github.com/bbfsdev/bbfs/issues/215)



Validation:
```
[genadyp@lnx-genadyp bbfs]$ rm ~/.bbfs/log/*
[genadyp@lnx-genadyp bbfs]$ ruby -Ilib bin/content_server 
^C
Interrupt or Exit happened in server:'content_server'.
Exception type:'Interrupt'.
Exception message:''.
Stopping process.
Force writing local content data to /home/genadyp/.bbfs/var/content.data.

[genadyp@lnx-genadyp bbfs]$ grep conf_file /home/genadyp/.bbfs/log/content_server000001.log
[INFO] [2013-08-19 18:40:54] [log.rb:116:Param #1: conf_file=/home/genadyp/.bbfs/etc/config_content_server.yml]

[genadyp@lnx-genadyp bbfs]$ 
[genadyp@lnx-genadyp bbfs]$ cd
[genadyp@lnx-genadyp ~]$ rm ~/.bbfs/log/*
[genadyp@lnx-genadyp ~]$ backup_server 
Interrupt or Exit happened in server:'backup_server'.
Exception type:'Interrupt'.
Exception message:''.
Stopping process.

[genadyp@lnx-genadyp ~]$ grep conf_file /home/genadyp/.bbfs/log/backup_server000001.log4r 
[INFO] [2013-08-19 18:41:42] [log.rb:116:Param #1: conf_file=/home/genadyp/.bbfs/etc/config_backup_server.yml]
```