Share server_password unit test between V2 & V2.1

This patch share unit tests of server_password between V2 & V2.1

Partially implements blueprint v2-on-v3-api

Change-Id: I74d67ada017aa43c5221890dd86c204797d870ef
Add API json schema to volumes api(v2.1)

Partially implements blueprint v2-on-v3-api

Change-Id: I2fd9e5a083055d12d9b7182beb902a5cbec8f1a9
Merge "Share server_password unit test between V2 & V2.1"
Merge "Add API json schema to volumes api(v2.1)"