Add CLI framework for Bottlenecks

JIRA: BOTTLENECK-65

Adding cli framwork for Bottlenecks.

Usage:
bottlenecks testcase run <testcase>

Currently only the cli framwork and testcase command group is added.
run, list, etc., commands and openstack command group
will added afterwards.

Two setup entries are added. One is within the top directory and the
other is within the cli directory.

Change-Id: I304f6f2e9b29b9f582953c2739806c1fb3e87fed
Signed-off-by: yuyang <Gabriel.yuyang@huawei.com>