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Why I did it
A recent version of contextlib2 (https://pypi.org/project/contextlib2/21.6.0/#history) has broken Python2 compatibility, so the version picked up by netaddr when using Python2 must be specified, or else builds fail
How I did it
Changed where netaddr is downloaded to also download the previous version of contextlib2
How to verify it
Build targets e.g. docker-sonic-mgmt-framework.gz
Which release branch to backport (provide reason below if selected)
Reason is that an external dependency has changed, which needs to be fixed on any branch that uses that dependency
Description for the changelog
Specify contextlib2 version for use with Python2
A picture of a cute animal (not mandatory but encouraged)