tests: fix warning with old GCC about missing struct initializer
tests: fix warning with old GCC about missing struct initializer

Old GCC isn't happy about the {0} initializer because the first
field in the struct is itself a struct.

../../tests/openvzutilstest.c: In function 'testReadNetworkConf':
../../tests/openvzutilstest.c:101:12: error: missing braces around initializer [-Werror=missing-braces]
     struct openvz_driver driver = {0};
            ^

This fixes commit 4a4132b4625778cf80acb9c92d06351b44468ac3

Signed-off-by: Daniel Berrange <bb938cf255e055ff3507f2627d214e8e62118fcf@localhost.localdomain>

crobinso/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,jardasgit/libvirt,nertpinx/libvirt,crobinso/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,libvirt/libvirt,jfehlig/libvirt,jardasgit/libvirt,nertpinx/libvirt,zippy2/libvirt,libvirt/libvirt,olafhering/libvirt,fabianfreyer/libvirt,libvirt/libvirt,zippy2/libvirt,nertpinx/libvirt,jfehlig/libvirt,olafhering/libvirt,zippy2/libvirt,crobinso/libvirt,libvirt/libvirt,jardasgit/libvirt,crobinso/libvirt,zippy2/libvirt,olafhering/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,jfehlig/libvirt,olafhering/libvirt