vboxsnapshotxmltest: Don't write to a file in abs_srcdir
vboxsnapshotxmltest: Don't write to a file in abs_srcdir

In the test, the snapshot XML is written into a file that's located
under:

  abs_srcdir/vboxsnapshotxmldata/testResult.vbox

However, the abs_srcdir doesn't have to be necessarily writable. It
should have been abs_builddir instead. Moreover, the label in the func
creating the file is called 'fail' while it fulfils the duty of
'cleanup' label.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

shugaoye/libvirt,VenkatDatta/libvirt,agx/libvirt,zippy2/libvirt,shugaoye/libvirt,agx/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,rlaager/libvirt,elmarco/libvirt,eskultety/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,agx/libvirt,taget/libvirt,rlaager/libvirt,olafhering/libvirt,datto/libvirt,datto/libvirt,elmarco/libvirt,jardasgit/libvirt,jardasgit/libvirt,libvirt/libvirt,VenkatDatta/libvirt,libvirt/libvirt,taget/libvirt,taget/libvirt,libvirt/libvirt,jfehlig/libvirt,shugaoye/libvirt,rlaager/libvirt,datto/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,elmarco/libvirt,andreabolognani/libvirt,elmarco/libvirt,rlaager/libvirt,andreabolognani/libvirt,crobinso/libvirt,fabianfreyer/libvirt,shugaoye/libvirt,shugaoye/libvirt,libvirt/libvirt,jardasgit/libvirt,crobinso/libvirt,zippy2/libvirt,fabianfreyer/libvirt,taget/libvirt,eskultety/libvirt,rlaager/libvirt,nertpinx/libvirt,jardasgit/libvirt,eskultety/libvirt,zippy2/libvirt,fabianfreyer/libvirt,olafhering/libvirt,datto/libvirt,jfehlig/libvirt,andreabolognani/libvirt,olafhering/libvirt,eskultety/libvirt,datto/libvirt,jfehlig/libvirt,nertpinx/libvirt,taget/libvirt,elmarco/libvirt,zippy2/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,crobinso/libvirt,crobinso/libvirt,jfehlig/libvirt,agx/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,agx/libvirt,andreabolognani/libvirt,eskultety/libvirt,olafhering/libvirt