Propagate errors from integration tests scripts.

Test: Presubmits.
Change-Id: Ie1f83c562a357e472bcaa95a4c1567a3e974d496

tests/bootstrap_test.sh

@@ -126,7 +126,7 @@ function test_glob_noop_incremental() {
 
   # This test needs to start from a clean build, but setup creates an
   # initialized tree that has already been built once.  Clear the out
-  # directory to start from scratch.
+  # directory to start from scratch (see b/185591972)
   rm -rf out
 
   mkdir -p a

tests/run_integration_tests.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/bash -eu
 
 TOP="$(readlink -f "$(dirname "$0")"/../../..)"
 "$TOP/build/soong/tests/bootstrap_test.sh"