[SPARK-14897][CORE] Upgrade Jetty to latest version of 8
[SPARK-14897][CORE] Upgrade Jetty to latest version of 8

## What changes were proposed in this pull request?

Update Jetty 8.1 to the latest 2016/02 release, from a 2013/10 release, for security and bug fixes. This does not resolve the JIRA necessarily, as it's still worth considering an update to 9.3.

## How was this patch tested?

Jenkins tests

Author: Sean Owen <sowen@cloudera.com>

Closes #12842 from srowen/SPARK-14897.

lxsmnv/spark,HyukjinKwon/spark,apache/spark,sahilTakiar/spark,ericvandenbergfb/spark,tengpeng/spark,gengliangwang/spark,skonto/spark,taroplus/spark,SnappyDataInc/spark,zhouyejoe/spark,Panos-Bletsos/spark-cost-model-optimizer,srowen/spark,publicRoman/spark,zero323/spark,rikima/spark,mike0sv/spark,UndeadBaneGitHub/spark,hvanhovell/spark,holdenk/spark,ericvandenbergfb/spark,apache/spark,big-pegasus/spark,MLnick/spark,jkbradley/spark,lxsmnv/spark,pgandhi999/spark,szhem/spark,WindCanDie/spark,map222/spark,brad-kaiser/spark,saltstar/spark,jlopezmalla/spark,MLnick/spark,janewangfb/spark,yanboliang/spark,Panos-Bletsos/spark-cost-model-optimizer,wzhfy/spark,eyalfa/spark,cin/spark,loneknightpy/spark,minixalpha/spark,bOOm-X/spark,zhouyejoe/spark,joseph-torres/spark,janewangfb/spark,1haodian/spark,ibm-research-ireland/sparkoscope,kimoonkim/spark,poffuomo/spark,lxsmnv/spark,ConeyLiu/spark,hhbyyh/spark,jiangxb1987/spark,loneknightpy/spark,highfei2011/spark,byakuinss/spark,SnappyDataInc/spark,spark-test/spark,LantaoJin/spark,ibm-research-ireland/sparkoscope,sahilTakiar/spark,zzcclp/spark,minixalpha/spark,sureshthalamati/spark,poffuomo/spark,matthewfranglen/spark,zero323/spark,adrian-ionescu/apache-spark,yanboliang/spark,HyukjinKwon/spark,liyichao/spark,brad-kaiser/spark,hhbyyh/spark,xuanyuanking/spark,janewangfb/spark,kimoonkim/spark,taroplus/spark,tejasapatil/spark,kissmetrics/spark,byakuinss/spark,big-pegasus/spark,shaneknapp/spark,saturday-shi/spark,sachintyagi22/spark,someorz/spark,mdespriee/spark,adrian-ionescu/apache-spark,holdenk/spark,actuaryzhang/spark,rezasafi/spark,caneGuy/spark,minixalpha/spark,apache-spark-on-k8s/spark,rikima/spark,techaddict/spark,michalsenkyr/spark,ueshin/apache-spark,aosagie/spark,debugger87/spark,ConeyLiu/spark,saltstar/spark,tejasapatil/spark,UndeadBaneGitHub/spark,wangyum/spark,goldmedal/spark,metamx/spark,bdrillard/spark,facaiy/spark,liyichao/spark,WindCanDie/spark,WindCanDie/spark,shaneknapp/spark,rednaxelafx/apache-spark,xuanyuanking/spark,SHASHANKB/spark,sureshthalamati/spark,jiangxb1987/spark,metamx/spark,mike0sv/spark,nilsgrabbert/spark,akopich/spark,nchammas/spark,1haodian/spark,aosagie/spark,minixalpha/spark,ueshin/apache-spark,maropu/spark,WeichenXu123/spark,cloud-fan/spark,srowen/spark,patrick-nicholson/spark,stanzhai/spark,jiangxb1987/spark,SHASHANKB/spark,tengpeng/spark,skonto/spark,markhamstra/spark,markhamstra/spark,goldmedal/spark,brad-kaiser/spark,apache/spark,hhbyyh/spark,wzhfy/spark,shubhamchopra/spark,jkbradley/spark,nchammas/spark,sachintyagi22/spark,LantaoJin/spark,liyichao/spark,SHASHANKB/spark,alunarbeach/spark,loneknightpy/spark,mahak/spark,vinodkc/spark,wangyum/spark,akopich/spark,gengliangwang/spark,lvdongr/spark,mzl9039/spark,mike0sv/spark,loneknightpy/spark,tejasapatil/spark,aokolnychyi/spark,setjet/spark,zero323/spark,wangyum/spark,ueshin/apache-spark,jlopezmalla/spark,SHASHANKB/spark,shubhamchopra/spark,pgandhi999/spark,lvdongr/spark,loneknightpy/spark,ibm-research-ireland/sparkoscope,chuckchen/spark,LantaoJin/spark,rikima/spark,apache/spark,nlalevee/spark,JoshRosen/spark,esi-mineset/spark,ConeyLiu/spark,akopich/spark,jrshust/spark,adrian-ionescu/apache-spark,dhruve/spark,szhem/spark,esi-mineset/spark,actuaryzhang/spark,cin/spark,nilsgrabbert/spark,jkbradley/spark,someorz/spark,apache/spark,1haodian/spark,bravo-zhang/spark,MLnick/spark,michalsenkyr/spark,huang1900/spark,eyalfa/spark,liutang123/spark,andrewor14/spark,stanzhai/spark,kiszk/spark,Aegeaner/spark,darionyaphet/spark,shuangshuangwang/spark,Panos-Bletsos/spark-cost-model-optimizer,adrian-ionescu/apache-spark,hhbyyh/spark,taroplus/spark,debugger87/spark,shuangshuangwang/spark,huang1900/spark,big-pegasus/spark,zuotingbing/spark,ptkool/spark,witgo/spark,mahak/spark,markhamstra/spark,rekhajoshm/spark,dbtsai/spark,ioana-delaney/spark,caneGuy/spark,chuckchen/spark,nlalevee/spark,pgandhi999/spark,icexelloss/spark,shubhamchopra/spark,bdrillard/spark,sachintyagi22/spark,jrshust/spark,maropu/spark,mike0sv/spark,sachintyagi22/spark,jkbradley/spark,ioana-delaney/spark,huang1900/spark,holdenk/spark,wzhfy/spark,rednaxelafx/apache-spark,dongjoon-hyun/spark,kiszk/spark,michalsenkyr/spark,lxsmnv/spark,rezasafi/spark,apache-spark-on-k8s/spark,alunarbeach/spark,ddna1021/spark,aray/spark,huang1900/spark,techaddict/spark,nlalevee/spark,dbtsai/spark,MLnick/spark,markhamstra/spark,map222/spark,jiangxb1987/spark,highfei2011/spark,narahari92/spark,WindCanDie/spark,jianran/spark,maropu/spark,mdespriee/spark,xflin/spark,panfengfeng/spark,kissmetrics/spark,wzhfy/spark,techaddict/spark,dongjoon-hyun/spark,narahari92/spark,nchammas/spark,techaddict/spark,yanboliang/spark,tejasapatil/spark,nlalevee/spark,ahnqirage/spark,publicRoman/spark,ueshin/apache-spark,sahilTakiar/spark,ahnqirage/spark,ericvandenbergfb/spark,hvanhovell/spark,cin/spark,byakuinss/spark,narahari92/spark,mzl9039/spark,ericvandenbergfb/spark,cloud-fan/spark,apache-spark-on-k8s/spark,milliman/spark,rikima/spark,taroplus/spark,ddna1021/spark,brad-kaiser/spark,ron8h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