networking: added connection keep alive script for Debian's Network-Manager.
networking: added connection keep alive script for Debian's Network-Manager.

Signed-off-by: Chris Lapa <711c73f64afdce07b7e38039a96d2224209e9a6c@lapa.com.au>

GusBricker/gb-system-scripts,GusBricker/gb-system-scripts