Remove how to contribute section in favor of CONTRIBUTING.rst
Remove how to contribute section in favor of CONTRIBUTING.rst

Change-Id: I5364d9d930ca0871bd839917b23ef3199eff3340

dsiddharth/access-keys,roopali8/keystone,dstanek/keystone,MaheshIBM/keystone,rickerc/keystone_audit,openstack/keystone,rushiagr/keystone,rajalokan/keystone,nuxeh/keystone,takeshineshiro/keystone,UTSA-ICS/keystone-kerberos,ilay09/keystone,dims/keystone,himanshu-setia/keystone,jumpstarter-io/keystone,openstack/keystone,idjaw/keystone,idjaw/keystone,nuxeh/keystone,ging/keystone,derekchiang/keystone,jumpstarter-io/keystone,vivekdhayaal/keystone,rajalokan/keystone,reeshupatel/demo,ajayaa/keystone,ilay09/keystone,UTSA-ICS/keystone-kerberos,dims/keystone,blueboxgroup/keystone,rushiagr/keystone,jamielennox/keystone,rodrigods/keystone,reeshupatel/demo,townbull/keystone-dtrust,ging/keystone,maestro-hybrid-cloud/keystone,openstack/keystone,jonnary/keystone,derekchiang/keystone,dstanek/keystone,cloudbau/keystone,cernops/keystone,ntt-sic/keystone,jumpstarter-io/keystone,derekchiang/keystone,klmitch/keystone,dstanek/keystone,cloudbau/keystone,rushiagr/keystone,nuxeh/keystone,reeshupatel/demo,jamielennox/keystone,mahak/keystone,roopali8/keystone,townbull/keystone-dtrust,vivekdhayaal/keystone,blueboxgroup/keystone,rickerc/keystone_audit,cloudbau/keystone,ilay09/keystone,ntt-sic/keystone,promptworks/keystone,klmitch/keystone,cernops/keystone,MaheshIBM/keystone,JioCloud/keystone,dsiddharth/access-keys,rajalokan/keystone,citrix-openstack-build/keystone,takeshineshiro/keystone,promptworks/keystone,jonnary/keystone,JioCloud/keystone,citrix-openstack-build/keystone,promptworks/keystone,maestro-hybrid-cloud/keystone,ntt-sic/keystone,townbull/keystone-dtrust,ajayaa/keystone,vivekdhayaal/keystone,dsiddharth/access-keys,mahak/keystone,mahak/keystone,himanshu-setia/keystone,citrix-openstack-build/keystone,rodrigods/keystone,rickerc/keystone_audit