Final 2.2.1 Release

• added logout method to log-out / de-authorize the current session
• added GroupManagement, UserManagement and SystemManagement classes
• added set_product_license method to the licensing class
• fixed various typos

Final 2.1.0 Release

minor changes from the RC release... basically around lab owner handling.

Release Candidate for the 2.1.0 release of the VIRL Client Library.

Changes since 2.0.0

• added additional examples (licensing, link conditioning)
• default username and password have been changed from virl2 to cml2 and cml2cml2, respectively
• entire code base is using Black for formatting
• link conditioning API added to library
• node CPU limiting added to library
• licensing added to library
• controller version checking done when connecting