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Build venv into deployed source dir (take 3)

Authored by awight on Nov 21 2017, 5:19 PM.

Description

Build venv into deployed source dir (take 3)

This moves the python library installation to the fetch stage, and stores
inside the source dir so we can rollback faster.

It also includes a redundant, transitional copy of the virtualenv. This must
be rebuilt separately, so is quite expensive and should be removed immediately
after migration.

Bug: T181071
Change-Id: Ifffbdcd090bbffaa020ccaebb284694cd501182b