--seeder=pip is breaking images where pip is not installed from source.
New virtualenv upstream release 20.0.2 has fixed the issue seen when
using sudo [1] by copying instead of symlinking and does not need this
fix anymore.
[1] f4fd6a0991
This reverts commit be9530ae163b8f27b219c4122c3583436c36e107.
Change-Id: I799982d9c023141cf612901084d4ecbd4447e969
e17d562000