Add Advanced Ping Graph Template to initial Installable templates

[TheWitness]

Feature Request

Is your feature request related to a problem? Please describe

There are multiple versions of the Advanced Ping Template floating around the internet. Standardize and update it for all Cacti users.

Describe the solution you'd like

Package the Advanced Ping Graph Template for all Cacti users.

[TheWitness]

Commit history is here: https://github.com/Cacti/cacti/commits/1.2.x/install/templates/PING_Advanced_Ping.xml.gz