Medium: Tools: hb2openais: add support for corosync (and more)

• utillib.sh moved, it has to be looked up
• readme fixed and updated
• hb_uuid/hostcache not removed to facilitate revert
• openais/corosync.conf parameters updated

(transplanted from 2667da5271c13d233e21cd9b975cb477f2380fa2)

Mercurial revision: 8b2ba75b7614a74fb3e9e6a0c7a5df553fce1362