ossec grsec login spam

During logins the script that displays the system info generates a grsec error. Removed the pam motd module to resolve it. fixes #813 

```
grsec: From 10.0.2.2: denied RWX mmap of <anonymous mapping> by /usr/bin/landscape-sysinfo[landscape-sysin:3393] uid/euid:0/0 gid/egid:0/0, parent /usr/share/landscape/landscape-sysinfo.wrapper[50-landscape-sy:3386] uid/euid:0/0 gid/egid:0/0
```