Use better description for group names in help and always prompt for members

When running <foo>-[add|remove]-member completely interactively it didn't
prompt for managing membership, it just reported that 0 members were
handled which was rather confusing.

This will work via a shell if you want to echo too:

$ echo "" | ipa group-add-member g1

This returns 0 members because nothing is read for users or group members.

$ echo -e "g1\nadmin\n" | ipa group-add-member

This adds the user admin to the group g1. It adds it as a user because
user membership is prompted for first.

ticket 415

0 files changed, 0 insertions, 0 deletions