add a relocatable wrapper for the portage programs

BUG=b:20895978

Change-Id: I1707bd1ea61e3b939bd875613dcf1d8c116a215a
17 files changed
tree: 6a24263d99366f245a2c59f9c93a43aa1d39f894
  1. .gitignore
  2. usr/
  3. wrapper.py