Revert "Suppress expected errors during group creation"

This reverts commit e42efbb41b35513c1e8e79d8fd68163553c8f4c8.
Revert "Only add users to specified group"

This reverts commit f1738e5f1b324191390d8592d01f3ef1d2c423a9.
Check for added group, remove unneeded const