Delete the old OpenSRF Perl modules from /openils/lib/perl5/OpenSRF, as they are now installed in the proper Perl lib directory:

rm -fr /openils/lib/perl5/OpenSRF

Follow all of the install instructions for installing OpenSRF 1.0 from scratch. Don't bother trying to keep your opensrf_core.xml, opensrf.xml, and srfsh.xml files around; the move to multi-domain OpenSRF (private services and public services) renders your old configuration files useless.