Fix SNMP community removal for Netgear

[CirnoT]

Pre-Request Checklist

• Passes rubocop code analysis (try rubocop --auto-correct)
• Tests added or adapted (try rake test)
• Changes are reflected in the documentation
• User-visible changes appended to CHANGELOG.md

Description

Before:

snmp-server community <hidden>
snmp-server community <hidden> 192.168.0.100 public
snmp-server community <hidden> 255.255.255.255 public

After:

snmp-server community <hidden>
snmp-server community ipaddr 192.168.0.100 <hidden>
snmp-server community ipmask 255.255.255.255 <hidden>

[codecov-commenter]

Codecov Report

Merging #2168 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2168   +/-   ##
=======================================
  Coverage   63.32%   63.32%           
=======================================
  Files          30       30           
  Lines        1497     1497           
=======================================
  Hits          948      948           
  Misses        549      549           

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[wk]

Thank you! Merging this.