MEDIUM: ssl: fatal error with bundle + openssl < 1.1.1

Since HAProxy 2.3, OpenSSL 1.1.1 is a requirement for using a
multi-certificate bundle in the configuration. This patch emits a fatal
error when HAProxy tries to load a bundle with an older version of
HAProxy.

This problem was encountered by an user in issue #990.

This must be backported in 2.3.

(cherry picked from commit b7fdfdfd92b9fdc6a3f742643760d6415fdc6f6b)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
2 files changed