ChangBo Guo(gcb) 03344561c0 doc: clean up oslo-incubator related stuff
We nuke oslo-incubator in commit b1871e57590efdbdf0bfada7bf0ae2c48bec9922,
This is follow up to clean up documents about oslo-incubator.

Change-Id: I4a6b7342570118ae116e896f29ce0a223421793a
2016-04-05 09:44:45 +00:00
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