Restconf draft11 - bad parsing

1. It is not possible to deserialize URI which contains leaf list identifier, for example: "/list-test:top/Y=x%3Ay". See test case "codecLeafListTest" in https://git.opendaylight.org/gerrit/#/c/39027/

2. When try to serialize YangInstanceIdentifier.EMPTY IndexOutOfBoundsException is thrown. See test case "emptyDataTest" in https://git.opendaylight.org/gerrit/#/c/39030/

3. Serializer does not know all reserved characters according to rfc3986. See test case "verifyReservedCharactersTest" in https://git.opendaylight.org/gerrit/#/c/39030/

4. When not all list keys are encoded serializer takes next identifier as next key value. https://git.opendaylight.org/gerrit/#/c/39027/