Create ExtendNetTelnetCisco.pm

This model extents the Net::Telnet::Cisco model to successfully access 
cable modems to run commands.
The purpose for this model is successful access of the modems with
the replication of the actual prompt which is required in accessing the device.
The Net::Telnet::Cisco Perl model does not replicate prompts of all devices
that communicate telnet.
can successfully access the devices the