The percolation of errors upward in the load process could
drop errors, meaning that a build tree could, depending on the
processing order, import the same directory as both "p/vendor/x"
and as "x". That's not supposed to be allowed. But then, worse,
the build would generate two jobs for building that directory,
which would use the same work space and overwrite each other's files,
leading to very strange failures.

Two fixes:

1. Fix the propagation of errors upward (prefer errors over success).
2. Check explicitly for duplicated packages before starting a build.

New test for #1.
Since #2 can't happen, tested #2 by hand after reverting fix for #1.

Fixes #11913.

Change-Id: I6d2fc65f93b8fb5f3b263ace8d5f68d803a2ae5c
Reviewed-on: https://go-review.googlesource.com/13022Reviewed-by: Ian Lance Taylor <iant@golang.org>