prelude section is prepared for general comments about a release [1].
At now neutron release notes use prelude section randomly.
Some rel notes use it and some do not.
This commit drop or move prelude section in Pike release notes.
In addition, some guideline on writing a release note
to the release notes howto page.
Change-Id: I53fefcc3eed30700d095c77d9e000319668097e8
Add support for QoS ingress bandwidth limiting in
linuxbridge agent.
It uses traffic shaping done by tc with tbf qdisc.
DocImpact: Ingress bandwidth limit in QoS supported by
Linuxbridge agent
Change-Id: Id495b302d31f5527db3e45b51517bc53153e7fc2
Partial-Bug: #1560961