MEDIUM: acl: automatically detect the type of certain fetches

MEDIUM: acl: automatically detect the type of certain fetches

Commit bef91e71 added the possibility to automatically use some fetch
functions instead of ACL functions, but for the fetch output type was
never used and setting the match method using -m was always mandatory.

Some fetch types are non-ambiguous and can intuitively be associated
with some ACL types :

    SMP_T_BOOL      -> bool
    SMP_T_UINT/SINT -> int
    SMP_T_IPV4/IPV6 -> ip

So let's have the ACL expression parser detect these ones automatically.

Other types are more ambiguous, especially everything related to strings,
as there are many string matching methods available and none of them is
the obvious standard matching method for any string. These ones will still
have to be specified using -m.