[kudu-CR] design-docs: add old multi-master heartbeating doc

["Adar Dembo (Code Review)" <ge...@cloudera.org>]

Hello Dan Burkert, Todd Lipcon,

I'd like you to do a code review.  Please visit

    http://gerrit.cloudera.org:8080/2495

to review the following change.

Change subject: design-docs: add old multi-master heartbeating doc
......................................................................

design-docs: add old multi-master heartbeating doc

This is Alex's old multi-master heartbeating doc, imported from gdocs and
rewritten for markdown. I'm importing it to serve as context for a new
multi-master doc that I'm writing.

For those who have permission, the old gdoc can be found here:
https://docs.google.com/document/d/10qQwSLYV8Zbjr4BiT1MZU5G8e6h-5ONOR1HDQEqdZGs/edit

Change-Id: I21dd3a859326f9886600022a0c4209831679b00f
---
M docs/design-docs/README.md
A docs/design-docs/old-multi-master-heartbeating.md
2 files changed, 165 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/95/2495/1
-- 
To view, visit http://gerrit.cloudera.org:8080/2495
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I21dd3a859326f9886600022a0c4209831679b00f
Gerrit-PatchSet: 1
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Adar Dembo <ad...@cloudera.com>
Gerrit-Reviewer: Dan Burkert <da...@cloudera.com>
Gerrit-Reviewer: Todd Lipcon <to...@apache.org>