CI testing: add http server to CI tests

Add an http server to CI tests so that HTTP booting and
loading can be tested.

Signed-off-by: Adriano Cordova <adriano.cordova@canonical.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

.azure-pipelines.yml

@@ -316,9 +316,20 @@ stages:
           fi
           export PATH=/opt/qemu/bin:/tmp/uboot-test-hooks/bin:\${PATH}
           export PYTHONPATH=/tmp/uboot-test-hooks/py/travis-ci
+          python3 -m http.server 80 --directory "\${UBOOT_TRAVIS_BUILD_DIR}" > /dev/null 2>&1 &
+          HTTP_PID=\$!
+          sleep 1  # Give the server a moment to start
+          if ps -p \${HTTP_PID} > /dev/null; then
+            export HTTP_PID
+          else
+            unset HTTP_PID
+          fi
           # "\${var:+"-k \$var"}" expands to "" if \$var is empty, "-k \$var" if not
           ./test/py/test.py -ra -o cache_dir="\$UBOOT_TRAVIS_BUILD_DIR"/.pytest_cache --bd \${TEST_PY_BD} \${TEST_PY_ID} \${TEST_PY_EXTRA} \${TEST_PY_TEST_SPEC:+"-k \${TEST_PY_TEST_SPEC}"} --build-dir "\$UBOOT_TRAVIS_BUILD_DIR" --report-dir "\$UBOOT_TRAVIS_BUILD_DIR" --junitxml=\$(System.DefaultWorkingDirectory)/results.xml
           # the below corresponds to .gitlab-ci.yml "after_script"
+          if [[ -n "\${HTTP_PID}" ]]; then
+            kill \${HTTP_PID};
+          fi
           rm -rf /tmp/uboot-test-hooks /tmp/venv
           EOF
       - task: CopyFiles@2