Reliably wait for soffice to terminate

...to avoid leftover soffice-related processes (oosplash, soffice.bin) from
UITests, whose occasional presence on tinderboxes is discussed in the comments
to <https://gerrit.libreoffice.org/#/c/79854/> "uitest: make child soffice
process die when parent dies".  Should sucha an soffice-related process fail to
terminate, the UITest will now fail to terminate too, and (a) a developer can
debug the hung processes or (b) a tinderbox can reliably kill all processes (cf.
<https://gerrit.libreoffice.org/plugins/gitiles/lode/+/
bea0738dbadfe8784e5d3c00f533acf101db4e7e%5E%21> "tb_slave_wrapper: trap signal
and kill -9 everything").  This is in line with the waiting in tearDown in
unotest/source/python/org/libreoffice/unotest.py, and with the corresponding
behavior of C++ and Java test frameworks in unotest.

Change-Id: Ieb5c48964428bc05fa8c0f83af9426641d6df693
Reviewed-on: https://gerrit.libreoffice.org/80175
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

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