Do not test on production!
Possible workaround for samba in a local AD:
cd
mkdir rpms
cd rpms/
# note: a multi-line command follows
wget ftp://fr2.rpmfind.net/linux/centos/7.3.1611/updates/x86_64/Packages/samba-4.4.4-14.el7_3.x86_64.rpm \
ftp://fr2.rpmfind.net/linux/centos/7.3.1611/updates/x86_64/Packages/samba-{client,client-libs,common-libs,common-tools,libs}-4.4.4-14.el7_3.x86_64.rpm \
ftp://fr2.rpmfind.net/linux/centos/7.3.1611/updates/x86_64/Packages/samba-common-4.4.4-14.el7_3.noarch.rpm \
ftp://fr2.rpmfind.net/linux/centos/7.3.1611/updates/x86_64/Packages/libsmbclient-4.4.4-14.el7_3.x86_64.rpm \
ftp://fr2.rpmfind.net/linux/centos/7.3.1611/updates/x86_64/Packages/libwbclient-4.4.4-14.el7_3.x86_64.rpm \
ftp://fr2.rpmfind.net/linux/centos/7.3.1611/os/x86_64/Packages/libtevent-0.9.28-1.el7.x86_64.rpm \
ftp://fr2.rpmfind.net/linux/centos/7.3.1611/updates/x86_64/Packages/sssd-libwbclient-1.14.0-43.el7_3.18.x86_64.rpm
yum downgrade ./*.rpm
rm /etc/alternatives/libwbclient.so.0.13-64
signal-event nethserver-samba-update
cd
rm -r rpms/ # add -f option to force removal without confirmation (use with care)