This commit should fully implement #1059. When the user selects the DNS
monitor option, a new input box has been added below the resolver
address allowing the user to implement the port to access the resolver
on. This uses the same `monitor.port` as the TCP monitor but a monitor
has been added to prefill the port value to the default of `53` if the
value in this field has not already been set. This is then cleared if
the user selects a different monitor type and has not changed the port
value. A translation has also been added explaining what this field
does in order to reduce any confusion. JSDoc documentation has also been
added to the `dnsResolve` function in `util-server.js`.
Signed-off-by: Matthew Nickson <mnickson@sidingsmedia.com>
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