Merge branch 'frozen-string-enable-spec-tasks' into 'master'

spec/db/production/settings_spec.rb

spec/tasks/cache/clear/redis_spec.rb

spec/tasks/config_lint_spec.rb

spec/tasks/gitlab/artifacts/check_rake_spec.rb

spec/tasks/gitlab/artifacts/migrate_rake_spec.rb

spec/tasks/gitlab/backup_rake_spec.rb

spec/tasks/gitlab/check_rake_spec.rb

spec/tasks/gitlab/cleanup_rake_spec.rb

spec/tasks/gitlab/db_rake_spec.rb

spec/tasks/gitlab/git_rake_spec.rb

spec/tasks/gitlab/gitaly_rake_spec.rb

spec/tasks/gitlab/info_rake_spec.rb

spec/tasks/gitlab/ldap_rake_spec.rb

spec/tasks/gitlab/lfs/check_rake_spec.rb

spec/tasks/gitlab/lfs/migrate_rake_spec.rb

spec/tasks/gitlab/shell_rake_spec.rb

spec/tasks/gitlab/storage_rake_spec.rb

spec/tasks/gitlab/task_helpers_spec.rb

spec/tasks/gitlab/uploads/check_rake_spec.rb

spec/tasks/gitlab/uploads/migrate_rake_spec.rb