adduser in busybox and adduser under meta-openembeded have different
behavior, adduser under meta-openembeded need Interactive Input like
below if you manually run ptest.
Enter the new value, or press ENTER for the default
Full Name []:
Room Number []:
...
remove the "Interactive Input" by add --gecos "" to align the behavior
also it is better for automation without interactive input
Signed-off-by: Changqing Li <changqing.li@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
