SNMP Engine "This element is not expected."

[hack3rman]

Describe the bug
According to the documentation there should be an engine option for random integers and increments. This does not seem to work.

To Reproduce
Steps to reproduce the behavior:

1. Copy the lines in snmp.xml

        <mib name="TCP-MIB">
            <symbol name="tcpInSegs">
                <value>tcpInSegs</value>
                <engine type="sysuptime"></engine>
            </symbol>
        </mib>    

2. Restart conpot
3. See error

2022-03-15 11:50:46,731 Error parsing XML template: /home/conpot/.local/lib/python3.8/site-packages/conpot/templates/default/snmp/snmp.xml:48:0:ERROR:SCHEMASV:SCHEMAV_ELEMENT_CONTENT: Element 'engine': This element is not expected.