BUG/MINOR: lua: bad args are returned for Lua actions

BUG/MINOR: lua: bad args are returned for Lua actions

In tcp actions case, the argument n - 1 is returned. For example:

  http-request lua.script stuff

display "stuff" as first arg

  tcp-request content lua.script stuff

display "lua.script" as first arg

The action parser doesn't use the *cur_arg value.

Thanks to Andy Franks for the bug report.

This patch mist be backported in haproxy-1.8 and haproxy-1.9