Updated "shell prompt" (to give a Debian feel)

Looks more like Debian shell prompt now (which is the default base OS).
Check comments for CentOS version.

#### Path: /root
**Current:** `nas3:~#`
**After:** `root@nas3:~#`
_CentOS: `[root@nas3 ~]#`_


#### Path: /var/log
**Current:** `nas3:/var/log#`
**After:** `root@nas3:/var/log#`
_CentOS: `[root@nas3 log]#`_