nova delete should return nonzero when it failed for any sever

[ugvddm]

If one server is deleted failed, the return code should be nozero.

[ozg@ozg-GREATWALL-PC python-novaclient(keystone_admin)]$ nova delete 49f1f516-ab5c-4625-aab6-67d9cb33cc77 123456
Request to delete server 49f1f516-ab5c-4625-aab6-67d9cb33cc77 has been accepted.
No server with a name or ID of '123456' exists.
[ozg@ozg-GREATWALL-PC python-novaclient(keystone_admin)]$ $?
0: command not found

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/106307

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/106307
Committed: https://git.openstack.org/cgit/openstack/python-novaclient/commit/?id=3955440ef2f57caf853a40e1cf28abe0a1d371ff
Submitter: Jenkins
Branch: master

commit 3955440ef2f57caf853a40e1cf28abe0a1d371ff
Author: Zhengguang <email address hidden>
Date: Fri Jul 11 04:32:37 2014 -0400

    Fix the return code of the command "delete"

    Currently, the command delete return a zero if it failed for any
    of servers, the return code should be a nonzero.

    Change-Id: If7009fdeb5a60fe2e357bcc447313cbdb7b2ff39
    Closes-Bug: #1339647