This is the second half of a patch. Only the part that had to be

re-based got pushed for some reason.

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

ipalib/plugins/group.py

@@ -101,7 +101,7 @@ class group(LDAPObject):
             pattern='^[a-zA-Z0-9_.][a-zA-Z0-9_.-]{0,252}[a-zA-Z0-9_.$-]?$',
             pattern_errmsg='may only include letters, numbers, _, -, . and $',
             maxlength=255,
-            cli_name='name',
+            cli_name='group_name',
             label=_('Group name'),
             primary_key=True,
             normalizer=lambda value: value.lower(),