CLEANUP: spoe: Remove unused label retry

This removes the retry labels from spoe_send_frame and spoe_recv_frame
which are unused since d5216d474d69856a282e4443f180af2093a80d6c, which
is unreleased, but was backported to haproxy 1.8 as
f13f3a4babdb1ce23a7e982c765704bca728111a.
1 file changed