Add new docker-sonic-mgmt makefile flag: LEGACY_SONIC_MGMT_DOCKER #17070
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Why I did it
This is part of Python3 migration project. This PR will add a new makefile flag: LEGACY_SONIC_MGMT_DOCKER
Now by default: LEGACY_SONIC_MGMT_DOCKER = y will build sonic-mgmt-docker with Python2 and Python3
If LEGACY_SONIC_MGMT_DOCKER = n will will sonic-mgmt-docker with Python3 only
Work item tracking
How I did it
Add makefile flag: LEGACY_SONIC_MGMT_DOCKER
How to verify it
By default will build sonic-mgmt-docker with Python2 and Python3. No change compared to before.
Set LEGACY_SONIC_MGMT_DOCKER=n will build sonic-mgmt-docker with Python3 only
Which release branch to backport (provide reason below if selected)
Tested branch (Please provide the tested image version)
Description for the changelog
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)