Release Notes and Supported Software for 5.0.1

Release Notes
- Add 5.0.1 to preface.rst
- Updated title in 040-resolved-issues.rst and 050-known-issues.rst
- Add 019-new-features-501.rst with contents
- 030-other-enhancements -- moved note about Ubuntu version so it follows
  note about CentOS version, before note about Heartbleed
- Add 039-resolved-issues-501.rst with contents

Release/date control files -- updated for 5.0.1

Planning Guide -- updated "Supported Software" list for:
- Icehouse 2014.1.1
- Ceph 0.67.9 "Dumpling"

Change-Id: Icc29422aae2ec2a9380e2076bc0d639364966f02