OVS UT: Fix some confusions between local vlan id and segmentation id
OVS UT: Fix some confusions between local vlan id and segmentation id

Also, use different values for them to expose mistakes.

Details:

There are two kinds of vlan ids involved here:
* local vlan id, which is managed by each agents in a node-local manner.
* segmentation id, which is managed by the corresponding ML2 type driver.
These tests use the distinct variables for them.
(LV_ID and LS_ID respectively)
However, these variables are misused in some places, relying on the fact
that their values are same.  (42)

Change-Id: Ib2ba74be74c2c361d25821acab2083a17b1b0173
mattt416/neutron,SmartInfrastructures/neutron,aristanetworks/neutron,adelina-t/neutron,JianyuWang/neutron,infobloxopen/neutron,magic0704/neutron,huntxu/neutron,asgard-lab/neutron,MaximNevrov/neutron,eonpatapon/neutron,shahbazn/neutron,cisco-openstack/neutron,yuewko/neutron,sasukeh/neutron,watonyweng/neutron,dims/neutron,sebrandon1/neutron,rdo-management/neutron,silenci/neutron,waltBB/neutron_read,adelina-t/neutron,shahbazn/neutron,antonioUnina/neutron,antonioUnina/neutron,yanheven/neutron,SmartInfrastructures/neutron,swdream/neutron,dhanunjaya/neutron,sasukeh/neutron,vivekanand1101/neutron,NeCTAR-RC/neutron,bigswitch/neutron,jerryz1982/neutron,mandeepdhami/neutron,jacknjzhou/neutron,jacknjzhou/neutron,sebrandon1/neutron,waltBB/neutron_read,wenhuizhang/neutron,aristanetworks/neutron,miyakz1192/neutron,bgxavier/neutron,cloudbase/neutron,JianyuWang/neutron,cloudbase/neutron,MaximNevrov/neutron,chitr/neutron,dhanunjaya/neutron,jumpojoy/neutron,paninetworks/neutron,mattt416/neutron,watonyweng/neutron,eonpatapon/neutron,JioCloud/neutron,noironetworks/neutron,glove747/liberty-neutron,bigswitch/neutron,igor-toga/local-snat,javaos74/neutron,mmnelemane/neutron,SamYaple/neutron,paninetworks/neutron,barnsnake351/neutron,klmitch/neutron,skyddv/neutron,openstack/neutron,mahak/neutron,bgxavier/neutron,igor-toga/local-snat,mahak/neutron,vivekanand1101/neutron,miyakz1192/neutron,jumpojoy/neutron,wenhuizhang/neutron,noironetworks/neutron,pnavarro/neutron,rdo-management/neutron,mmnelemane/neutron,JioCloud/neutron,javaos74/neutron,infobloxopen/neutron,Stavitsky/neutron,wolverineav/neutron,cisco-openstack/neutron,yanheven/neutron,pnavarro/neutron,alexandrucoman/vbox-neutron-agent,huntxu/neutron,wolverineav/neutron,dims/neutron,jerryz1982/neutron,apporc/neutron,takeshineshiro/neutron,glove747/liberty-neutron,suneeth51/neutron,neoareslinux/neutron,magic0704/neutron,neoareslinux/neutron,barnsnake351/neutron,openstack/neutron,apporc/neutron,klmitch/neutron,SamYaple/neutron,alexandrucoman/vbox-neutron-agent,mandeepdhami/neutron,swdream/neutron,eayunstack/neutron,mahak/neutron,NeCTAR-RC/neutron,suneeth51/neutron,asgard-lab/neutron,takeshineshiro/neutron,chitr/neutron,silenci/neutron,cloudbase/neutron-virtualbox,eayunstack/neutron,yuewko/neutron,cloudbase/neutron-virtualbox,Stavitsky/neutron,skyddv/neutron,openstack/neutron