message: Clean license check so that it does not print irrelevant bazel ERROR msg.
diff: @@ -324,9 +324,12 @@ do_external_licenses_check(){
  LICENSES_FILE="$(mktemp)_licenses.log"
  MISSING_LICENSES_FILE="$(mktemp)_missing_licenses.log"
  EXTRA_LICENSES_FILE="$(mktemp)_extra_licenses.log"
  + TMP_FILE="$(mktemp)_tmp.log"
  echo "Getting external dependencies for ${BUILD_TARGET}"
  - bazel query "attr('licenses', 'notice', deps(${BUILD_TARGET}))" --keep_going \
  + bazel query "attr('licenses', 'notice', deps(${BUILD_TARGET}))" --keep_going > "${TMP_FILE}" 2>&1
  + cat "${TMP_FILE}" \
  + | grep -e "^\/\/" -e "^@" \
  | grep -E -v "^//tensorflow" \
  | sed -e 's|:.*||' \
  | sort \
  @@ -335,7 +338,9 @@ do_external_licenses_check(){
  echo
  echo "Getting list of external licenses mentioned in ${LICENSES_TARGET}."
  - bazel query "deps(${LICENSES_TARGET})" --keep_going \
  + bazel query "deps(${LICENSES_TARGET})" --keep_going > "${TMP_FILE}" 2>&1
  + cat "${TMP_FILE}" \
  + | grep -e "^\/\/" -e "^@" \
  | grep -E -v "^//tensorflow" \
  | sed -e 's|:.*||' \
  | sort \
  