replace is_gitlab_user? with gitlab_user?

lib/system_check/app/git_config_check.rb

@@ -20,7 +20,7 @@ module SystemCheck
       # Returns true if all subcommands were successful (according to their exit code)
       # Returns false if any or all subcommands failed.
       def repair!
-        return false unless is_gitlab_user?
+        return false unless gitlab_user?
 
         command_success = OPTIONS.map do |name, value|
           system(*%W(#{Gitlab.config.git.bin_path} config --global #{name} #{value}))

lib/tasks/gitlab/task_helpers.rb

@@ -104,7 +104,7 @@ module Gitlab
       Gitlab.config.gitlab.user
     end
 
-    def is_gitlab_user?
+    def gitlab_user?
       return @is_gitlab_user unless @is_gitlab_user.nil?
 
       current_user = run_command(%w(whoami)).chomp
@@ -114,7 +114,7 @@ module Gitlab
     def warn_user_is_not_gitlab
       return if @warned_user_not_gitlab
 
-      unless is_gitlab_user?
+      unless gitlab_user?
         current_user = run_command(%w(whoami)).chomp
 
         puts " Warning ".color(:black).background(:yellow)