Fix for OPENSTACK-1370
Fix for OPENSTACK-1370

Remove diplicate elif statement from plugin.sh

Change-Id: I04002be815726a37bd3bab6f3a9b5667aa09e2e5
Closes-Bug: OPENSTACK-1370

nuagenetworks/nuage-openstack-neutron,naveensan1/nuage-openstack-neutron,nuagenetworks/nuage-openstack-neutron,naveensan1/nuage-openstack-neutron