xmppdiff: Make more diffs interesting

Previously, only diffs that contained added *and* deleted lines were
considered "interesting".

This is a curious definition that I was unable to find in other hooks,
and definitely not what we wanted/expected.

CHANGELOG.md

@@ -19,6 +19,7 @@
 * MISC: scrubs macsec key from Arista EOS (@krisamundson)
 * MISC: rubocop dependency now ~> 0.80.0
 * MISC: rugged dependency now ~> 0.28.0
+* MISC: xmppdiff now also shows diffs with only removed or added lines (@jplitza)
 
 ## 0.27.0
 

lib/oxidized/hook/xmppdiff.rb

@@ -21,8 +21,6 @@ def run_hook(ctx)
         interesting = diff[:patch].lines.to_a[4..-1].any? do |line|
           ["+", "-"].include?(line[0]) && (not ["#", "!"].include?(line[1]))
         end
-        interesting &&= diff[:patch].lines.to_a[5..-1].any? { |line| line[0] == '-' }
-        interesting &&= diff[:patch].lines.to_a[5..-1].any? { |line| line[0] == '+' }
 
         if interesting
           log "Connecting to XMPP"