add shadow-update-pam-conf.patch to update the pam related configure files
in oe way rather than Fedora.
(From OE-Core rev: 10e6fdd7e8fed5733f65a504148bba54bccb3c48)
Signed-off-by: Kang Kai <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>