BUG/MINOR: acl: set arg_list->kw to aclkw->kw string literal if aclkw is found

BUG/MINOR: acl: set arg_list->kw to aclkw->kw string literal if aclkw is found

During configuration parsing *args can contain different addresses, it is
changing from line to line. smp_resolve_args() is called after the
configuration parsing, it uses arg_list->kw to create an error message, if a
userlist referenced in some ACL is absent. This leads to wrong keyword names
reported in such message or some garbage is printed.

It does not happen in the case of sample fetches. In this case arg_list->kw is
assigned to a string literal from the sample_fetch struct returned by
find_sample_fetch(). Let's do the same in parse_acl_expr(), when find_acl_kw()
lookup returns a corresponding acl_keyword structure.

This fixes the issue #3088 at GitHub.
This should be backported in all stable versions since 2.6 including 2.6.

(cherry picked from commit 441cd614f92bd3d7d66003e509ae71bcb779b0f5)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit 802fc568c81c67af3461d3b58a324a4d8aef5508)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit 789c30fc9b6f3ed1fcb9e12b8133db7e2ea36393)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>