Improve account copying (#1069)

With this fix, all nested slices and pointers will be copied by value.
Also, this fixes tests to compare the original and copy account by their
values by marshaling them to JSON strings.

Before that, they were copying the pointers that also passed the simple `=` compassion
(as the addresses match).

management/server/user.go

@@ -120,9 +120,7 @@ func (u *User) Copy() *User {
 	copy(autoGroups, u.AutoGroups)
 	pats := make(map[string]*PersonalAccessToken, len(u.PATs))
 	for k, v := range u.PATs {
-		patCopy := new(PersonalAccessToken)
-		*patCopy = *v
-		pats[k] = patCopy
+		pats[k] = v.Copy()
 	}
 	return &User{
 		Id:              u.Id,