MINOR: http-act/tcp-act: Add "set-mark" and "set-tos" for tcp content rules

MINOR: http-act/tcp-act: Add "set-mark" and "set-tos" for tcp content rules

It is now possible to set the Netfilter MARK and the TOS field value in all
packets sent to the client from any tcp-request rulesets or the "tcp-response
content" one. To do so, the parsing of "set-mark" and "set-tos" actions are
moved in tcp_act.c and the actions evaluation is handled in dedicated functions.

This patch may be backported as far as 2.2 if necessary.