Adjust it so that updated packages are not removed.

Anvil has its own dependencies which may be updated
by later installs. Instead of removing those later
updated packages we should just keep them around so
that anvil can continue working.

Fixes bug 1211647

Change-Id: Ie8523b80ca3f9114eb1bbad12be456d2e1bdc10c
Merge "Adjust it so that updated packages are not removed."