MINOR: http_act: Add -m flag for del-header name matching method

This patch adds -m flag which allows to specify header name
matching method when deleting headers from http request/response.
Currently beg, end, sub, str and reg are supported.

This is related to GitHub issue #909

(cherry picked from commit ebdd4c55da4360bde7878604ea528c2031a26541)
Signed-off-by: William Lallemand <wlallemand@haproxy.org>
5 files changed