Add suffixes to OpenStack resource names

Add suffixes to OpenStack resource names

All vnf testcases have to add suffixes in OpenStack resources names
simply because the password is now generated before any run [1].

Snaps mainly creates the resource only if unfound in all tenants [2].
Then one remaining resource could easily raise permissions denied.
It avoid conflicts between vrouter and cloudify_ims which are using the
same names.

[1] https://gerrit.opnfv.org/gerrit/#/c/50747/
[2] https://jira.opnfv.org/browse/SNAPS-257

Depends-On: If56cc44fe35ca06bc9033af620ddd3c0586877fe
Change-Id: I1800886e575189b64fdc580a5ee6b59c81fcde5c
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>