Fix duplicate logging
Fix duplicate logging

- when running bin/keystone, duplicate FileHandlers
  were intialized. A check now prevents this.
- Fixes bug 844959
- Addresses some of blueprint keystone-logging

Change-Id: Ic017423091c35f37721dbda7af0fa253541647c6

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