lock_any_ref_for_update(): reject wildcard return from check_ref_format

lock_any_ref_for_update(): reject wildcard return from check_ref_format

Recent check_ref_format() returns -3 as well as -1 (general
error) and -2 (less than two levels).  The caller was explicitly
checking for -1, to allow "HEAD" but still needed to disallow
bogus refs.

This introduces symbolic constants for the return values from
check_ref_format() to make them read better and more
meaningful.  Normal ref creation codepath can still treat
non-zero return values as errors.

Signed-off-by: Junio C Hamano <gitster@pobox.com>