Source linuxbridge_agent in linuxbridge plugin
Source linuxbridge_agent in linuxbridge plugin

devstack neutron lib needs to find some functions named
'neutron_plugin_configure_XXXXXX' in the neutron plugin lib
Part of them are usually in the plugin agent file.

For linuxbridge plugin some of theses functions are missing.
This change load the linuxbridge_agent file in linuxbridge file to make
missing functions available to neutron lib when linux bridge plugin is used.

Fix bug #1195237

Change-Id: I567bedc84e77c041e9418773fba1f74b33bcf604

liuquansheng47/devstack,mssumanth/devstack,CloudServer/devstack,innodee/openstackk,prithivm/branch01,upadhyay-prashant/devstack,pombredanne/devstack,virtualopensystems/devstack,pombredanne/devstack,yamt/devstack,varunarya10/devstack,noironetworks/devstack,rushiagr/devstack,Yuriy-Leonov/devstack,parul24/devstack,prithivm/branch01,bswartz/devstack,parul24/devstack,nuxeh/devstack,Juniper/devstack,avvocatodemarchis/devstack,group-policy/devstack,varunarya10/devstack,mc2014/devstack,Mahito/devstack,bigswitch/devstack,neerja28/Devstack_GlusterFS,jamielennox/devstack,inkerra/devstack,CiscoSystems/devstack,pacinete/devstack,eshnil2000/devstack,CloudServer/devstack,JioCloud/devstack,herrsechs/devstack,pczerkas/devstack,avvocatodemarchis/devstack,noironetworks/devstack,srics/devstack,promptworks/devstack,vsham20/devstack,HPCHub/devstack,vsham20/devstack,pczerkas/devstack,rushiagr/devstack,sc68cal/devstack,ozamiatin/devstack,ozamiatin/devstack,olivierlemasle/devstack,LoHChina/devstack,dirkmueller/devstack,j4/devstack,liuquansheng47/devstack,thomasem/devstack,andrewrothstein/devstack,herrsechs/devstack,atulpatil301/devstack,samgoon/devstack,Mahito/devstack,j4/devstack,BSJAIN92/OpenStack,neerja28/Devstack_GlusterFS,costingalan/devstack,wenhuizhang/devstack,andrewrothstein/devstack,thomasem/devstack,TwinkleChawla/devstack,tianweizhang/devstack,affo/devstack,Millnert/contrail-devstack,mmasaki/devstack,TwinkleChawla/devstack,mmasaki/devstack,eharney/devstack,bq-xiao/devstack,wenhuizhang/devstack,sc68cal/devstack,deepakselvaraj/devstack,dtroyer/devstack,upadhyay-prashant/devstack,openstack-dev/devstack,flavio-fernandes/devstack,nawawi/openstack,samgoon/devstack,atulpatil301/devstack,sequenceiq/devstack,tianweizhang/devstack,LoHChina/devstack,sequenceiq/devstack,group-policy/devstack,HPCHub/devstack,richliu/devstack,bigswitch/devstack,NaokiMiyata/devstack,promptworks/devstack,bq-xiao/devstack,nawawi/openstack,vishnugonela/devstack,NaokiMiyata/devstack,bljgaurav/openstack-test,dirkmueller/devstack,vishnugonela/devstack,bswartz/devstack,kplus/devstack-moonshot,bljgaurav/openstack-test,richliu/devstack,mc2014/devstack,openstack-dev/devstack,eharney/devstack,pacinete/devstack,flavio-fernandes/devstack,dtroyer/devstack,nuxeh/devstack,mssumanth/devstack,costingalan/devstack,kplus/devstack-moonshot,BSJAIN92/OpenStack,affo/devstack,williamthegrey/devstack,olivierlemasle/devstack