useradd.bbclass: retry useradd/groupadd commands to avoid lock race issues
A race condition can occur when adding users and groups to the
passwd and group files, causing errors like the following:
ERROR: Function 'useradd_sysroot' failed
Tried to access "/etc/group" but this was locked.
This fix will cause the useradd code to retry the useradd and
groupadd commands up to 10 times (with a 1s sleep in between
attempts) before failing.
This fixes [YOCTO #1794]
(From OE-Core rev:
68c589f1b5ee36f0aff151b728447ffdae14622c)
Signed-off-by: Scott Garman <scott.a.garman@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Joshua Lock <josh@linux.intel.com>
