connstat should output possible fields when providing an invalid command-line field

[sebroy]

connstat outputs a python backtrace when I try and output an invalid field:

delphix@localhost:~$ connstat -e -F lport=2049 -o garbage -i 1
Traceback (most recent call last):
  File "/usr/bin/connstat", line 209, in <module>
    output_fields.append(Field[item])
  File "/usr/lib/python3.6/enum.py", line 329, in __getitem__
    return cls._member_map_[name]
KeyError: 'garbage'

[sdimitro]

I think this issue has been fixed and we should close this entry. Currently:

$ connstat -e -F lport=2049 -o garbage -i 1
Unknown field: 'garbage