BUG/MINOR: http: Missing calloc return value check while parsing tcp-request/tcp...

BUG/MINOR: http: Missing calloc return value check while parsing tcp-request/tcp-response

A memory allocation failure happening in tcp_parse_tcp_req or
tcp_parse_tcp_rep when trying to allocate an act_rule structure would
have resulted in a crash. These functions are only called during
configuration parsing.

It was raised in GitHub issue #1233.
It could be backported to all stable branches.

(cherry picked from commit 2ca42b4656f60655a5295a66f321239faee2d9fe)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit 8f86a29d20a094fede1b60695754aed3bebabe44)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>