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
This commit adds new API call that allows to discover
details about supported QoS rule type and its parameters
by each of loaded backend drivers.
DocImpact: New call to get details about supported
rule_type for each loaded backend driver
ApiImpact
Change-Id: I2008e9d3e400dd717434fbdd2e693c9c5e34c3a4
Closes-Bug: #1686035