Read new key license_v2 from SUBNET response

[anjalshireesh]

Community Contribution License

All community contributions in this pull request are licensed to the project maintainers
under the terms of the [Apache 2 license] (https://www.apache.org/licenses/LICENSE-2.0).
By creating this pull request I represent that I have the right to license the
contributions to the project maintainers under the Apache 2 license.

Description

SUBNET now has a v2 of license that is returned in the new key license_v2. mc will start reading and storing the same.
(The old key license is deprecated but is still available in SUBNET response to ensure that the current released version of mc doesn't break)

Motivation and Context

Stay up-to-date with license changes in SUBNET

How to test this PR?

Following commands should continue to work fine:

• mc license register
• mc license update
• mc support diag
• mc support perf
• mc support profile
• mc support inspect

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Unit tests added/updated
• Internal documentation updated
• Create a documentation update request here

[shtripat]

LGTM. Verified.