BUG/MINOR: checks: Respect check-ssl param when a port or an addr is specified

BUG/MINOR: checks: Respect check-ssl param when a port or an addr is specified

When a check port or a check address is specified, the check transport layer is
ignored. So it is impossible to do a SSL check in this case. This bug was
introduced by the commit 8892e5d30 ("BUG/MEDIUM: server/checks: Init server
check during config validity check").

This patch should fix the issue #643. It must be backported to all branches
where the above commit was backported.

(cherry picked from commit 66163ec616bd3dfb06605bfc5a6e640ea7ada7d7)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>