IFP: Add wildcard requests
    
    Resolves:
        https://fedorahosted.org/sssd/ticket/2553
    
    Can be used as:
    
    dbus-send --print-reply --system --dest=org.freedesktop.sssd.infopipe \
            /org/freedesktop/sssd/infopipe/Users \
            org.freedesktop.sssd.infopipe.Users.ListByName \
            string:r\* uint32:10
    
    dbus-send --print-reply --system --dest=org.freedesktop.sssd.infopipe \
            /org/freedesktop/sssd/infopipe/Groups \
            org.freedesktop.sssd.infopipe.Groups.ListByName \
            string:r\* uint32:10
    
    dbus-send --print-reply --system --dest=org.freedesktop.sssd.infopipe \
            /org/freedesktop/sssd/infopipe/Users \
            org.freedesktop.sssd.infopipe.Users.ListByDomainAndName \
            string:ipaldap string:r\* uint32:10
    
    dbus-send --print-reply --system --dest=org.freedesktop.sssd.infopipe \
            /org/freedesktop/sssd/infopipe/Groups \
            org.freedesktop.sssd.infopipe.Groups.ListByDomainAndName \
            string:ipaldap string:r\* uint32:10
    
    By default the wildcard_limit is unset, that is, the request will return
    all cached entries that match.
    
    Reviewed-by: Pavel Březina <pbrezina@redhat.com>