Add fragment match options

[knewell]

# set match fragment ?
Possible completions:
  [                    Open a set of values
  dont-fragment        Don't Fragment flag is set
  first-fragment       First fragment
  is-fragment          Fragmented packet
  last-fragment        Last fragment
  not-a-fragment       Not a fragment

[knewell]

<configuration junos:changed-seconds="1585877797" junos:changed-localtime="2020-04-03 01:36:37 UTC">
        <routing-options>
            <flow>
                <route>
                    <name>test</name>
                    <match>
                        <fragment>first-fragment</fragment>
                        <fragment>is-fragment</fragment>
                        <source>192.168.200.1/32</source>
                    </match>
                    <then>
                        <discard/>
                    </then>
                </route>
            </flow>
        </routing-options>
</configuration>