Cleanup HACKING.rst
Cleanup HACKING.rst

* Point to new location for hacking doc
(http://docs.openstack.org/developer/hacking/)
* Remove openstack-common section because already in main hacking doc

Change-Id: I7fbcfe13469a75fed08700ccbe07fefbee33db22

leeseuljeong/leeseulstack_neutron,Juniper/contrail-dev-neutron,sasukeh/neutron,magic0704/neutron,igor-toga/local-snat,glove747/liberty-neutron,antonioUnina/neutron,openstack/neutron,mattt416/neutron,suneeth51/neutron,JioCloud/neutron,wolverineav/neutron,JioCloud/neutron,yamahata/tacker,cloudbase/neutron,vveerava/Openstack,swdream/neutron,SmartInfrastructures/neutron,Metaswitch/calico-neutron,NeCTAR-RC/neutron,skyddv/neutron,CiscoSystems/vespa,vijayendrabvs/hap,virtualopensystems/neutron,sajuptpm/neutron-ipam,mahak/neutron,yanheven/neutron,vijayendrabvs/ssl-neutron,huntxu/neutron,mahak/neutron,leeseulstack/openstack,Juniper/neutron,yamahata/neutron,barnsnake351/neutron,zhhf/charging,beagles/neutron_hacking,vveerava/Openstack,vivekanand1101/neutron,NeCTAR-RC/neutron,cernops/neutron,aristanetworks/neutron,silenci/neutron,SmartInfrastructures/neutron,sajuptpm/neutron-ipam,asgard-lab/neutron,eayunstack/neutron,ntt-sic/neutron,beagles/neutron_hacking,MaximNevrov/neutron,oeeagle/quantum,vijayendrabvs/ssl-neutron,swdream/neutron,CiscoSystems/neutron,asgard-lab/neutron,neoareslinux/neutron,pnavarro/neutron,sasukeh/neutron,miyakz1192/neutron,CiscoSystems/vespa,watonyweng/neutron,vbannai/neutron,apporc/neutron,eonpatapon/neutron,SamYaple/neutron,gkotton/neutron,Metaswitch/calico-neutron,JianyuWang/neutron,yamahata/tacker,wenhuizhang/neutron,noironetworks/neutron,sebrandon1/neutron,sajuptpm/neutron-ipam,yamahata/neutron,wenhuizhang/neutron,klmitch/neutron,jerryz1982/neutron,antonioUnina/neutron,apporc/neutron,pnavarro/neutron,magic0704/neutron,Juniper/neutron,noironetworks/neutron,CiscoSystems/vespa,jerryz1982/neutron,gkotton/neutron,gopal1cloud/neutron,klmitch/neutron,Comcast/neutron,JianyuWang/neutron,eonpatapon/neutron,blueboxgroup/neutron,jumpojoy/neutron,CiscoSystems/neutron,jacknjzhou/neutron,skyddv/neutron,mmnelemane/neutron,dims/neutron,redhat-openstack/neutron,dhanunjaya/neutron,ntt-sic/neutron,projectcalico/calico-neutron,huntxu/neutron,cisco-openstack/neutron,neoareslinux/neutron,bgxavier/neutron,aristanetworks/neutron,leeseulstack/openstack,CiscoSystems/neutron,wolverineav/neutron,leeseuljeong/leeseulstack_neutron,alexandrucoman/vbox-neutron-agent,vveerava/Openstack,blueboxgroup/neutron,rdo-management/neutron,chitr/neutron,Juniper/contrail-dev-neutron,gopal1cloud/neutron,bigswitch/neutron,vijayendrabvs/hap,jumpojoy/neutron,barnsnake351/neutron,oeeagle/quantum,SamYaple/neutron,openstack/neutron,chitr/neutron,ntt-sic/neutron,igor-toga/local-snat,mattt416/neutron,javaos74/neutron,zhhf/charging,yanheven/neutron,sebrandon1/neutron,silenci/neutron,cernops/neutron,glove747/liberty-neutron,infobloxopen/neutron,shahbazn/neutron,infobloxopen/neutron,adelina-t/neutron,zhhf/charging,dhanunjaya/neutron,bigswitch/neutron,yamahata/tacker,leeseuljeong/leeseulstack_neutron,cloudbase/neutron-virtualbox,mandeepdhami/neutron,alexandrucoman/vbox-neutron-agent,paninetworks/neutron,vijayendrabvs/hap,Comcast/neutron,shahbazn/neutron,virtualopensystems/neutron,bgxavier/neutron,openstack/neutron,waltBB/neutron_read,rdo-management/neutron,adelina-t/neutron,javaos74/neutron,mahak/neutron,cisco-openstack/neutron,beagles/neutron_hacking,paninetworks/neutron,Juniper/neutron,mandeepdhami/neutron,takeshineshiro/neutron,Stavitsky/neutron,projectcalico/calico-neutron,gkotton/neutron,vivekanand1101/neutron,blueboxgroup/neutron,vbannai/neutron,MaximNevrov/neutron,redhat-openstack/neutron,leeseulstack/openstack,miyakz1192/neutron,yamahata/neutron,cloudbase/neutron,vijayendrabvs/ssl-neutron,takeshineshiro/neutron,eayunstack/neutron,waltBB/neutron_read,Juniper/contrail-dev-neutron,cloudbase/neutron-virtualbox,yuewko/neutron,virtualopensystems/neutron,Stavitsky/neutron,mmnelemane/neutron,watonyweng/neutron,Comcast/neutron,jacknjzhou/neutron,yuewko/neutron,vbannai/neutron,suneeth51/neutron,dims/neutron