Updated Device packages for Synology, Citrix NetScaler, Cisco ASA/Cisco

[TheWitness]

Feature Request

Is your feature request related to a problem? Please describe

Cacti Device Packages have been stagnant for some time. In an effort to catch up the Cacti packages with the community add some new packages and enhance others.

Describe the solution you'd like

Add: Synology NAS, Citrix NetScaler, Cisco ASA, and improve Cisco Router packages.

[TheWitness]

First Commit is here: 219d40e

[TheWitness]

Next Commit is here: b068598