Ruby plugins: apply code changes as suggested by "rubocop --auto-correct"

plugins/router/ag241-adsl

@@ -35,7 +35,6 @@ Some magical munin foo...
 
 =end
 
-
 # Require this module, it is part of the standard ruby lib AFAIK
 require 'net/http'
 
@@ -49,7 +48,7 @@ stat = nil
 # Check executable "name" for parameter count
 params = $0.split('_')
 if params.size != 3
-  puts "Incorrect number of parameters"
+  puts 'Incorrect number of parameters'
   exit 1
 end
 
@@ -59,11 +58,11 @@ host = params[1]
 stat = params[2]
 
 unless ENV['debug'].nil?
-  puts "user = " + user
-  puts "pass = " + pass
-  puts "host = " + host
-  puts "port = " + port
-  puts "stat = " + stat
+  puts 'user = ' + user
+  puts 'pass = ' + pass
+  puts 'host = ' + host
+  puts 'port = ' + port
+  puts 'stat = ' + stat
 end
 
 # Dump the graph configuration data
@@ -101,7 +100,7 @@ s = response.body
 
 # Make sure we got the page successfully
 if response.code != '200'
-  puts "Getting web page failed:"
+  puts 'Getting web page failed:'
   case response.code
   when '401'
     puts 'Probably because the username and password are incorrect'
@@ -124,12 +123,12 @@ when 'syncrate'
 when 'attenuation'
   a = s.scan(/.*share\.lineatt.*\n.*share\.down[^0-9]*([0-9]+).*share\.up[^0-9]*([0-9]+).*$/)
   b, c = a[0]
-  puts 'down.value ' + (b.to_i).to_s + "\n" + 'up.value ' + (c.to_i).to_s
+  puts 'down.value ' + b.to_i.to_s + "\n" + 'up.value ' + c.to_i.to_s
   exit 0
 when 'margin', 'noise'
   a = s.scan(/.*share\.noise.*\n.*share\.down[^0-9]*([0-9]+).*share\.up[^0-9]*([0-9]+).*$/)
   b, c = a[0]
-  puts 'down.value ' + (b.to_i).to_s + "\n" + 'up.value ' + (c.to_i).to_s
+  puts 'down.value ' + b.to_i.to_s + "\n" + 'up.value ' + c.to_i.to_s
   exit 0
 else
   puts 'Statistic ' + stat.to_s + ' not known, would you like me to fabricate it for you?'