Supported software, fixed issues

Fixed Release number/date in preface/preface.rst, pdf/pdf*, common_conf.py

install-guide/0000-intro -- updated version numbers for RabbitMQ, Ceph,
and My SQL.  Havana number is up-to-date; all others are unchanged

release-notes/042-resolved-in-411-issues
- Added note about Heartbleed
- Added note about two Savanna logging issues that are fixed
  (moved from known issues)

release-notes/050-known-issues
- 2 Savanna/sahara  bugs are fixed

Change-Id: I4844356c080cdf77b00d4a768764b98cc80fc87d