Fix the "devel" test wheel directory and error output

The build-*.sh tests are failing when trying to import the (successfully!) built pip packages, because the wheel is now in "pip_pkg", not "pip", as the old tests worked.

Also, the assembler didn't output stderr from the tests because of the wrong variable being used.

PiperOrigin-RevId: 287567386
Change-Id: I6d6e5d55bafec9a443271b1640fffcaf596d2f8b

tensorflow/tools/dockerfiles/assembler.py

@@ -656,7 +656,7 @@ def main(argv):
                 eprint('>>> No test standard out.')
               if err:
                 eprint('>>> Output stderr:')
-                eprint(out.decode('utf-8'))
+                eprint(err.decode('utf-8'))
               else:
                 eprint('>>> No test standard err.')
               if code != 0:

tensorflow/tools/dockerfiles/tests/build-cpu.sh

@@ -34,5 +34,5 @@ yes "" | /usr/local/bin/python configure.py
 # Build the pip package and import
 bazel build --cxxopt="-D_GLIBCXX_USE_CXX11_ABI=0" --config=opt --config=v2 tensorflow/tools/pip_package:build_pip_package
 ./bazel-bin/tensorflow/tools/pip_package/build_pip_package pip_pkg --gpu --nightly_flag
-pip --no-cache-dir install --upgrade /tmp/pip/tensorflow-*.whl
+pip --no-cache-dir install --upgrade /tmp/pip_pkg/tensorflow-*.whl
 

tensorflow/tools/dockerfiles/tests/build-gpu.sh

@@ -37,4 +37,4 @@ yes "" | /usr/local/bin/python configure.py
 # Build the pip package and import
 bazel build --config=cuda --cxxopt="-D_GLIBCXX_USE_CXX11_ABI=0" --config=opt --config=v2 tensorflow/tools/pip_package:build_pip_package
 ./bazel-bin/tensorflow/tools/pip_package/build_pip_package pip_pkg --gpu --nightly_flag
-pip --no-cache-dir install --upgrade /tmp/pip/tensorflow-*.whl
+pip --no-cache-dir install --upgrade /tmp/pip_pkg/tensorflow-*.whl