Don't leave the CAS id uninitialized in process_update_command.
Don't leave the CAS id uninitialized in process_update_command.

This leads to spurious failures in commands that don't support CAS.

zbase/memcached,rhli/memcached,amyvmiwei/memcached,cloudrain21/memcached,samanbarghi/memcached,tmharrisonwang/memcached,jbergstroem/memcached,msg7086/repcached,tomykaira/memcached,guikcd/memcached,alexandermerritt/memcached,niaomingjian/memcached,tmharrisonwang/memcached,fengshao0907/memcached,kamyu104/memcached,surajdharmapuram/memcached,rmccullagh/memcached,couchbase/memcached,mdounin/memcached,dkrotx/memcached-dd,fengshao0907/memcached,membase/moxi,rhli/memcached,angusfenying/memcached-win64,samt42/memcached,saumitra/memcached,dianerdianer/memcached,Distrotech/memcached,shelsonjava/memcached,steveyen/moxi,couchbase/moxi,sagark/memcached-accel,memcached/memcached,leverich/memcached-affinity,rmccullagh/memcached,msg7086/repcached,elfchief/memcached,saumitra/memcached,leverich/memcached-affinity,Distrotech/memcached,guikcd/memcached,dustin/memcached,surajdharmapuram/memcached,DigitalAce/memcached,romanticode/memcached,mdounin/memcached,owendCB/memcached,emcconville/memcached,bpzhang/memcached,daverigby/memcached,Metaswitch/memcached,mrkwse/memcached,Danzeer/memcached,tomykaira/memcached,niaomingjian/memcached,steveyen/moxi,samanbarghi/memcached,ZhangZhenhua/memcached,dianerdianer/memcached,memcached/memcached,myPublicGit/memcached,zbase/memcached,zbase/memcached,Dhruva6/memcached,membase/moxi,daverigby/memcached,gencer/memcached,tmharrisonwang/memcached,romanticode/memcached,memcached/memcached,gencer/memcached,tmharrisonwang/memcached,daverigby/kv_engine,mitliucak/memcached,williamcheungthu/memcached,dormando/memcached,zaycev/memcached,EdwardLee03/memcached,saumitra/memcached,abhinavdangeti/memcached,zbase/moxi,abhinavdangeti/memcached,couchbase/moxi,rhli/memcached,amyvmiwei/memcached,myPublicGit/memcached,elfchief/memcached,msg7086/repcached,gencer/memcached,jimwwalker/memcached,sagark/memcached-accel,surajdharmapuram/memcached,ClearwaterCore/memcached,cloudrain21/memcached,dormando/memcached,neutronsharc/memcached,dkrotx/memcached-dd,niaomingjian/memcached,leverich/memcached-affinity,amyvmiwei/memcached,DigitalAce/memcached,zaycev/memcached,samt42/memcached,daverigby/kv_engine,fengshao0907/memcached,leedc/memcached,amyvmiwei/memcached,EdwardLee03/memcached,rmccullagh/memcached,couchbase/moxi,fengshao0907/memcached,couchbase/moxi,jbergstroem/memcached,daverigby/memcached,zbase/moxi,Dhruva6/memcached,Dhruva6/memcached,shelsonjava/memcached,angusfenying/memcached-win64,13693100472/memcached,ClearwaterCore/memcached,Metaswitch/memcached,guikcd/memcached,zbase/moxi,xiaosl/memcached,emcconville/memcached,cloudrain21/memcached-1,zbase/moxi,myPublicGit/memcached,shelsonjava/memcached,zaycev/memcached,zbase/memcached,samanbarghi/memcached,memcached/memcached,samt42/memcached,mitliucak/memcached,dormando/memcached,steveyen/moxi,jeremiahyan/memcached,sagark/memcached-accel,13693100472/memcached,jimwwalker/memcached,sagark/memcached-accel,xiaosl/memcached,samt42/memcached,13693100472/memcached,cloudrain21/memcached-1,xiaosl/memcached,EdwardLee03/memcached,zbase/memcached,msg7086/repcached,alexandermerritt/memcached,dustin/memcached,ZhangZhenhua/memcached,leedc/memcached,dormando/memcached,Metaswitch/memcached,zaycev/memcached,13693100472/memcached,guikcd/memcached,Dhruva6/memcached,williamcheungthu/memcached,owendCB/memcached,Danzeer/memcached,tellapart/memcached,surajdharmapuram/memcached,daverigby/kv_engine,leedc/memcached,tellapart/memcached,Danzeer/memcached,samanbarghi/memcached,elfchief/memcached,mrkwse/memcached,williamcheungthu/memcached,owendCB/memcached,tomykaira/memcached,couchbase/moxi,shelsonjava/memcached,cloudrain21/memcached,mrkwse/memcached,dkrotx/memcached-dd,xiaosl/memcached,dianerdianer/memcached,cloudrain21/memcached,williamcheungthu/memcached,dormando/memcached,owendCB/memcached,rhli/memcached,allen8807/memcached-1,kamyu104/memcached,jeremiahyan/memcached,myPublicGit/memcached,membase/moxi,jeremiahyan/memcached,guikcd/memcached,steveyen/moxi,Metaswitch/memcached,couchbase/memcached,neutronsharc/memcached,dianerdianer/memcached,neutronsharc/memcached,EdwardLee03/memcached,zbase/moxi,mrkwse/memcached,romanticode/memcached,membase/moxi,romanticode/memcached,couchbase/memcached,bpzhang/memcached,kamyu104/memcached,abhinavdangeti/memcached,couchbase/moxi,steveyen/moxi,osheroff/memcached_kdtree,gencer/memcached,ClearwaterCore/memcached,DigitalAce/memcached,rmccullagh/memcached,Distrotech/memcached,osheroff/memcached_kdtree,jeremiahyan/memcached,osheroff/memcached_kdtree,leedc/memcached,ZhangZhenhua/memcached,tellapart/memcached,daverigby/kv_engine,cloudrain21/memcached-1,msg7086/repcached,elfchief/memcached,ZhangZhenhua/memcached,13693100472/memcached,mitliucak/memcached,rmccullagh/memcached,angusfenying/memcached-win64,DSrcl/memcached,ClearwaterCore/memcached,Metaswitch/memcached,DSrcl/memcached,alexandermerritt/memcached,membase/moxi,Danzeer/memcached,dustin/memcached,mdounin/memcached,kamyu104/memcached,jimwwalker/memcached,tomykaira/memcached,couchbase/memcached,niaomingjian/memcached,angusfenying/memcached-win64,cloudrain21/memcached-1,allen8807/memcached-1,allen8807/memcached-1,daverigby/memcached,emcconville/memcached,allen8807/memcached-1,sagark/memcached-accel,alexandermerritt/memcached,gencer/memcached,membase/moxi,bpzhang/memcached,elfchief/memcached,memcached/memcached,abhinavdangeti/memcached,bpzhang/memcached,neutronsharc/memcached,abhinavdangeti/memcached,DSrcl/memcached,dkrotx/memcached-dd,jbergstroem/memcached,DSrcl/memcached,mitliucak/memcached,emcconville/memcached