Add cinder CLI tests "qos-list" and "encryption-type-list"

Below two tests are added for cinder cli:
qos-list
encryption-type-list

Change-Id: Ic025ec401135b1de64871ef1df368cd13f85f7a3
Mising CLI test for Keystone

This patch adds following missing Keystone CLI test -
1. ec2 credentialslist

Partially implements: blueprint missing-cli-tests-in-tempest

Change-Id: Ibf0070e12f3087756addcbed841d52c73cf70553
Merge "Add cinder CLI tests "qos-list" and "encryption-type-list""
Merge "Mising CLI test for Keystone"
Merge branch 'master' of https://github.com/openstack/tempest