Share suspend_server unit test between V2 & V2.1

This patch moves suspend_server unit test from v3 directory to contrib
and makes it shared by V2 and V21.

PS. suspend_server unit test cases was removed from admin actions unit
test case.

Partially implements blueprint v2-on-v3-api
Change-Id: I44d9bf8d70f8a9c6916a18c354285e950c2fa550
Merge "Share suspend_server unit test between V2 & V2.1"