Prioritize docker over vagrant

Removed instructions to retag baseimage
to "latest" in doc and .yaml files.
More explicit instructions for retagging peer
lines minimized to 80
curl commands updated to fix path to v0.6
[ci skip]

Change-Id: I89682ceb9f48188fc4b2bf738f8f87bfc26768f9
Signed-off-by: Nick Gaski <[email protected]>

Author: nickgaski