Document the unnecessary method invoking in FakeRing
Document the unnecessary method invoking in FakeRing

Add comment to explain why we invoke the get_part method even if the
_part_shift is equal to 32.

Closes-Bug:  #1335581

Change-Id: I160e9383b5e65f75ed5e89511cc7e63c51958a25

anishnarang/gswift,hbhdytf/mac2,williamthegrey/swift,matthewoliver/swift,AfonsoFGarcia/swift,redbo/swift,Seagate/swift,daasbank/swift,Akanoa/swift,notmyname/swift,swiftstack/swift,bouncestorage/swift,AfonsoFGarcia/swift,clayg/swift,psachin/swift,bradleypj823/swift,clayg/swift,hbhdytf/mac,tipabu/swift,notmyname/swift,williamthegrey/swift,maginatics/swift,redhat-openstack/swift,hurricanerix/swift,Seagate/swift,bradleypj823/swift,mjwtom/swift,notmyname/swift,scality/ScalitySproxydSwift,hurricanerix/swift,maginatics/swift,nadeemsyed/swift,takeshineshiro/swift,thiagodasilva/swift,tipabu/swift,nadeemsyed/swift,bkolli/swift,hbhdytf/mac2,anishnarang/gswift,Em-Pan/swift,IPVL/swift-kilo,prashanthpai/swift,aerwin3/swift,dencaval/swift,Em-Pan/swift,wenhuizhang/swift,smerritt/swift,prashanthpai/swift,redhat-openstack/swift,dpgoetz/swift,rackerlabs/swift,daasbank/swift,scality/ScalitySproxydSwift,tipabu/swift,wenhuizhang/swift,openstack/swift,matthewoliver/swift,dpgoetz/swift,openstack/swift,matthewoliver/swift,gold3bear/swift,iostackproject/IO-Bandwidth-Differentiation,psachin/swift,bouncestorage/swift,clayg/swift,tipabu/swift,larsbutler/swift,zackmdavis/swift,revoer/keystone-8.0.0,hbhdytf/mac2,notmyname/swift,thiagodasilva/swift,swiftstack/swift,takeshineshiro/swift,shibaniahegde/OpenStak_swift,mjzmjz/swift,mjzmjz/swift,Akanoa/swift,psachin/swift,smerritt/swift,redbo/swift,levythu/swift,sarvesh-ranjan/swift,nadeemsyed/swift,rackerlabs/swift,smerritt/swift,eatbyte/Swift,iostackproject/IO-Bandwidth-Differentiation,clayg/swift,matthewoliver/swift,aerwin3/swift,IPVL/swift-kilo,nadeemsyed/swift,smerritt/swift,openstack/swift,revoer/keystone-8.0.0,hbhdytf/mac2,sarvesh-ranjan/swift,hbhdytf/mac,zackmdavis/swift,hurricanerix/swift,dencaval/swift,mjwtom/swift,openstack/swift,shibaniahegde/OpenStak_swift,psachin/swift,swiftstack/swift,hurricanerix/swift,bkolli/swift,larsbutler/swift,gold3bear/swift,eatbyte/Swift,levythu/swift