useradd-staticids.bbclass: Read passwd/group files before parsing

Read and merge the passwd/group files before parsing the user and
group definitions. This means they will only be read once per
recipe. This solves a problem where if a user was definied in multiple
files, it could generate group definitions for groups that should not
be created. E.g., if the first passwd file read defines a user as:

foobar::1234::::

and the second passwd file defines it as:

foobar:::nogroup:The foobar user:/:/bin/sh

then a foobar group would be created even if the user will use the
nogroup as its primary group.

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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