EMANE unable to use realtime mode when started from init script on Fedora 15

```
When cored.py is started from the /etc/init.d/core script with an EMANE
scenario, EMANE fails with:
"ABORT could not set sceduler to realtime"

http://pf.itd.nrl.navy.mil/pipermail/core-users/2012-January/000763.html

This occurs with CORE 4.2 or svn and EMANE 0.7.2 on Fedora 15 i686/x86_64.

The workaround is to start cored.py manually from a root terminal.

```

Original issue reported on code.google.com by `ahrenh...@gmail.com` on 11 Jan 2012 at 6:50

Start with /etc/init.d/core and the cored.py startup path, comparing how they run on Fedora 15 with starting cored.py from a root terminal. Reproduce the EMANE 0.7.2 realtime-mode failure and determine what differs between the two launch contexts; done means the init-script launch can set the realtime scheduler successfully.

Written by the indexing model from the issue text.