[OE-core] Using users/groups from another recipe than the one creating them

[Peter Kjellerstedt]

Which assumption is correct: "a recipe A that depends on another 
recipe B can use users/groups that B creates" or "all recipes must 
create the users/groups they require themselves"?

The problem for us is that we have a lot of recipes that create 
users and groups, and subsequently a number of other related recipes 
that need to use those users and groups. 

If the first assumption is correct then the useradd.bbclass needs to 
be corrected so that it adds a dependency from do_install to 
base-passwd:do_populate_sysroot and 
base-passwd:do_populate_sysroot_setscene, because if either of those 
tasks execute they will overwrite /etc/passwd and /etc/group, 
effectively removing any users/groups that were created earlier...

On the other hand, if it is the second assumption that is correct, 
then there should be QA tests in place to make sure all recipes 
create the users/groups they use.

//Peter