[0.2.x] [FIX] UserAdmin actually expects a 'name' to be present

Looks like a typo made UserAdmin and NamedUserAdmin behave the same. UserAdmin should inherit only from StrippedUserAdmin, so it can have no 'name'

Backport of 5fe8995633e805d028d38cf5315cc538e6ffcc05 from master.
[0.2.x] How To Create Users Without Setting Their Password

Backport of c45d1ebc6f72fded1f95784c80f56e3b7713aa56 from master.
Changes for 0.2.1
(cherry picked from commit 116d07d3449373af58b84ad149bacb2db6c9c49c)
Version 0.2.1