Lin Tan 0d75fa62e5 Add Code Contribution Guide for Ironic
Add a code contribution guide for Ironic. This should be useful for
developers to consider some key points when write and review
Ironic code.

First introduces things related to live-upgrade which consists
of RPC version and Object version.

Change-Id: I1d243a20151827a35aed465061befbcf65f96474
Implements: blueprint online-upgrade-support
2015-12-07 16:50:44 +08:00
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