During investigation of the issues found that error message had
not user friendly format:
 local pwgr_errstr = "get%s failed [errno %d]: %s"
produced:
 [001] LuajitError: builtin/pwd.lua:101: getgetgrall failed [errno 2]: No such file or directory
while it had to be:
 [001] LuajitError: builtin/pwd.lua:101: getgrall failed [errno 2]: No such file or directory
Fixed the error message.