fix validation if ca is used with crt and key
fix validation if ca is used with crt and key

An undocumented but inherited behavior from the so called ingress
controller common code base allows to use a ca.crt key along with
crt and key. However a crt validation was failing due to the missing
intermediate crts in the validation. There is no behavioral change
when using crt and key without a ca.

jcmoraisjr/haproxy-ingress,jcmoraisjr/haproxy-ingress