ebuild: check for QA issues in preinst logs too

The pkg_preinst phase is still safe to die in, so run QA checks
after that too to catch common errors like "command not found".

BUG=chromium:821145
TEST=CQ passes

Change-Id: I6db81fbcfba7b3f6d7d96b5a3febbdc6b21c2c91
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/portage_tool/+/2085971
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed