Keystone v3 support

[digvijay2040]

• Added support for Keystone V3
• it supports different project_domain id and user_domain id.

[digvijay2040]

update below params in your workload file:

• project_domain -> project domain id
• user_domain -> user domain id
• auth_url -> auth url

ex:
<auth type="keystone" config="username={{USERNAME}};password={{PASSWORD}};project_domain={{PROJECT_DOMAIN_ID}};user_domain={{USER_DOMAIN_ID}};tenant_name={{TENANT_NAME}};auth_url={{AUTH_URL}};service=swift;retry=5"/>