Add modules and examples for zScaler NFVs

[displague]

Create modules and examples for the zScaler devices:

• https://docs.equinix.com/en-us/Content/Interconnection/NE/deploy-guide/Zscaler/NE-create-Zscaler-App-Conn.htm
• https://docs.equinix.com/en-us/Content/Interconnection/NE/deploy-guide/Zscaler/NE-create-Zscaler-PSE.htm

[Fuxbert]

Any chance somebody could look into this? There is urgent demand for a functioning Zscaler module / resource doc / example... Thanks!