rubocop: Use tr instead of gsub

Signed-off-by: Christian Menges <[email protected]>

lib/fluent/config/v1_parser.rb

@@ -150,8 +150,8 @@ def parse_include(attrs, elems)
       def eval_include(attrs, elems, uri)
         # replace space(s)(' ') with '+' to prevent invalid uri due to space(s).
         # See: https://github.com/fluent/fluentd/pull/2780#issuecomment-576081212
-        u = URI.parse(uri.gsub(/ /, '+'))
-        if u.scheme == 'file' || (!u.scheme.nil? && u.scheme.length == 1) || u.path == uri.gsub(/ /, '+') # file path
+        u = URI.parse(uri.tr(' ', '+'))
+        if u.scheme == 'file' || (!u.scheme.nil? && u.scheme.length == 1) || u.path == uri.tr(' ', '+') # file path
           # When the Windows absolute path then u.scheme.length == 1
           # e.g. C:
           path = URI.decode_www_form_component(u.path)

lib/fluent/plugin/in_http.rb

@@ -428,7 +428,7 @@ def on_headers_complete(headers)
         @content_type = ""
         @content_encoding = ""
         headers.each_pair {|k,v|
-          @env["HTTP_#{k.gsub('-','_').upcase}"] = v
+          @env["HTTP_#{k.tr('-','_').upcase}"] = v
           case k
           when /\AExpect\z/i
             expect = v
@@ -585,7 +585,7 @@ def on_message_complete
           query_params = WEBrick::HTTPUtils.parse_query(uri.query)
 
           query_params.each_pair {|k,v|
-            params["QUERY_#{k.gsub('-','_').upcase}"] = v
+            params["QUERY_#{k.tr('-','_').upcase}"] = v
           }
         end