Document for Euphrates test case results

Document for Euphrates test case results

JIRA: YARDSTICK-1132

In B and C releases, Yardstick provides an overview of the results of test cases
developed by Yardstick, executed on OPNFV community labs.

This work has not been done for the D and E releases, although result analysis
for Euphrates is available at (https://wiki.opnfv.org/display/yardstick/Euphrates+release+test+results+analysis).
We plan to restart to provide a basic test case results analysis for Fraser and compare performance data with Euphrates.

This JIRA ticket will be resolved into 3 commits: 1. Document for E release test case data; 2. Document for F release test case data;
3. Document for results analysis.

Change-Id: I372a60807ac3dfaab87e70cdb956c1059b019f7a
Signed-off-by: JingLu5 <lvjing5@huawei.com>
(cherry picked from commit 4c20fb57684bc21e7ae0461341088100e518307d)