after excute check-vlan-interface ， the vlan interface was deleted.

[bailin.zhang]

if the vlan interface is not exist,the command can not excute.

if I creat a vlan interface, the vlan interface was deleted after the command was excuted.

for example:
(steth) check-vlan-interface server-164 server-110 er1 20
Agent: server-164 has no interface named er1.20!
(steth) check-vlan-interface server-164 server-110 efl 5
AgentA and agentB has already added the interface efl.5
AgentA and agentB has already setup the IP 192.168.100.164/24 and IP 192.168.100.110/24
AgentA and agentB has already deleted thevlan 5 in efl

[yaowei (yaowei-deactivatedaccount)]

In check-vlan-interface process, we should :
1. check server-A eth.vlan_id exists, A_exists = True/False
   1.1 if A_exists ==False, then add vlan interface in server-A
2. check server-B eth.vlan_id exists, B_exists = True/False
 2.1 if B_exists ==False, then add vlan interface in server-B

3. do some check else such as ping server-B form server-A via eth.vlan_id

4. teardown vlan_interface:
 4.1 if if A_exists ==False, then teardown vlan interface in server-A
 4.2 if if B_exists ==False, then teardown vlan interface in server-B

@bailin.zhang, do you agree with this?

[bailin.zhang (bailin-zhang)]

OK

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/291518

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/291518
Committed: https://git.openstack.org/cgit/openstack/steth/commit/?id=c8b511fe1ddf3b644716b9581e8b738dd68372a5
Submitter: Jenkins
Branch: master

commit c8b511fe1ddf3b644716b9581e8b738dd68372a5
Author: changzhi1990 <email address hidden>
Date: Fri Mar 11 10:31:29 2016 +0800

    Fix bug when checking vlan interface

    Change-Id: I91fde669874c12c49b325c58073372ea6632dd2b
    Close-Bug: 1552506