man: Substitute entity values for entity references
Validation of xml files failed with new version of libxml2 (CVE-2014-0191)
make[2]: Entering directory `/builddir/build/BUILD/sssd-1.9.2/src/man'
/usr/bin/xmllint --catalogs --postvalid --nonet --xinclude --noout sss_usermod.8.xml
sss_usermod.8.xml:4: element reference: validity error : No declaration for element reference
sss_usermod.8.xml:5: element title: validity error : No declaration for element title
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
(cherry picked from commit b772ceb6e5cdda62aa98d4fc61f4800b9779b74a)