redhat: clean up the partial-kgcov-snip.config file
Since MR !1433 (merged) we generate a redhat/configs/partial-kgcov-snip.config file but none of the clean targets remove it. Fix this by having dist-clean-configs remove any partial-*-snip.config file.
Signed-off-by: Patrick Talbert ptalbert@redhat.com