MEDIUM: sample: handle comma-delimited converter list

MEDIUM: sample: handle comma-delimited converter list

We now support having a comma-delimited converter list, which can start
right after the fetch keyword. The immediate benefit is that it allows
to use converters in log-format expressions, for example :

   set-header source-net %[src,ipmask(24)]

The parser is also slightly improved and should be more resilient against
configuration errors. Also, optional arguments in converters were mistakenly
not allowed till now, so this was fixed.