useradd-staticids.bbclass: Allow missing UIDs/GIDs to generate warnings
Previously when USERADD_ERROR_DYNAMIC was set to "1", an exception was
raised if no numeric UID/GID could be determined for a user/group. Now
it is possible to set it to either "error", which results in the old
behavior, or "warn" in which case a warning is issued instead.
For backwards compatibility reasons, it is still possible to set
USERADD_ERROR_DYNAMIC to "1" and get an exception in case of failure.
Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
