Create UNO API property testers for common, so it's possible to share/use
them between all the UNO API service property tests.
Testers are available for the types 'boolean', 'long', 'short', and
'string'.

Change-Id: Ia36dba98c774695b3ba6ac9d9917af9fb20efdba
Reviewed-on: https://gerrit.libreoffice.org/51259Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jens Carl <j.carl43@gmx.de>