Azure virtual networks

Description

Added azurenetwork package which has function GetAllVNet that helps in gathering info about virtual networks for a subscriptionID.
This package also includes function GetAllSubscriptionIDs to get all subscriptionIDs in an account level

Added azurevnetcollector package which helps in gathering info about virtual networks for subscriptionIDs in an account level.

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• [ x ] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ x ] I have signed the Adobe Open Source CLA.
• [ x ] My code follows the code style of this project.
• [ x ] My change requires a change to the documentation.
• I have updated the documentation accordingly.
• [ x ] I have read the CONTRIBUTING document.
• [ x ] I have added tests to cover my changes.
• [ x ] All new and existing tests passed.