Create uniq servers in nova console tests

Avoid races with console access to test servers.

Related-Prod: PRODX-38643
Change-Id: Ic6389c9527893438ba16d15ea7a56a8d241837bf
(cherry picked from commit d566ee92387de163ad00a4aa89e220194a56063a)
(cherry picked from commit ee2767ce0b6a362b4de090569ef0ea5938462c8a)
1 file changed