The declared components in a test of uno api don't change much
or at all, so instead of duplicating this in every test, define
it in a common file use when needed. Some more common things
could be extracted in a similar way.

Change-Id: I07ae641afca55ffaf3c5c93624bfaa2143590886
Reviewed-on: https://gerrit.libreoffice.org/51079Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>