Makefile: tighten tests/utils limit
Makefile: tighten tests/utils limit

2813 lines are too many for tests/utils, but they are still better than
the former 3565.

Signed-off-by: Dan Kenigsberg <184831158ae7531bcabc22617ed51e8717c81e93@redhat.com>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt