Revert "Install pip packages during build installation."
Revert "Install pip packages during build installation."

This reverts commit 506bb6ed53f801a6bccd1ffd3fa70b1d37273ab9.

google/makani,google/makani,google/makani,google/makani,google/makani,google/makani,google/makani,google/makani,google/makani