Added @attr(slow) for slow tests

4 jobs for add-slow-attr in 139 minutes and 18 seconds (queued for 9 seconds)
Status Job ID Name Coverage
  Build
passed #181523
docker
build_linux_36

02:19:16

70.0%
passed #181524
docker
build_linux_37

02:09:40

70.0%
passed #181521
macosx
build_macosx_36

02:01:06

70.0%
passed #181522
macosx
build_macosx_37

02:00:16

70.0%