This should hopefully avoid name clashes during the test runs. During
the test runs two tests can try to access the same temp file which
causes one test to fail. Using the pid as part of the temp file name
should avoid that problem.

Change-Id: I696c3d34e33a5d8e9234238d86f1201ecdfa66ec
Reviewed-on: https://gerrit.libreoffice.org/15455Tested-by: Jenkins <ci@libreoffice.org>
Tested-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>