Merge 3.1 branch to trunk.
r3353:3535 https://svn.forgerock.org/openidm/branches/3.1-earlyprototype



git-svn-id: https://svn.forgerock.org/openidm/trunk@3537 d98387aa-ee2c-4292-a9e6-504d2a719fd3
[OPENIDM-1902] Update cluster chapter

git-svn-id: https://svn.forgerock.org/openidm/trunk@3538 d98387aa-ee2c-4292-a9e6-504d2a719fd3