opendaylight-action-types.yang: ipv[46]-address are actually an ipv[46]-prefix

in file: .../controller.git/opendaylight/md-sal/model/model-flow-base/src/main/yang/opendaylight-action-types.yang

it is a bit confusing that the field referred as ipv4-address and ipv6-address
are actually of types ipv4-prefix and ipv6-prefix, respectively.

grouping address {
choice address {
case ipv4 {
leaf ipv4-address

{ type inet:ipv4-prefix; }

}
case ipv6 {
leaf ipv6-address

{ type inet:ipv6-prefix; }

}
}
}