[SPARK-8111] [SPARKR] SparkR shell should display Spark logo and version banner on startup.
[SPARK-8111] [SPARKR] SparkR shell should display Spark logo and version banner on startup.

spark version is taken from the environment variable SPARK_VERSION

Author: Alok  Singh <singhal@Aloks-MacBook-Pro.local>
Author: Alok  Singh <singhal@aloks-mbp.usca.ibm.com>

Closes #6944 from aloknsingh/aloknsingh_spark_jiras and squashes the following commits:

ed607bd [Alok  Singh] [SPARK-8111][SparkR] As per suggestion, 1) using the version from sparkContext rather than the Sys.env. 2) change "Welcome to SparkR!" to "Welcome to" followed by Spark logo and version
acd5b85 [Alok  Singh] fix the jira SPARK-8111 to add the spark version and logo. Currently spark version is taken from the environment variable SPARK_VERSION

someorz/spark,hhbyyh/spark,xflin/spark,mahak/spark,ibm-research-ireland/sparkoscope,shubhamchopra/spark,darionyaphet/spark,kimoonkim/spark,liyichao/spark,xflin/spark,JoshRosen/spark,loneknightpy/spark,alunarbeach/spark,shubhamchopra/spark,yanboliang/spark,JoshRosen/spark,lvdongr/spark,saturday-shi/spark,cin/spark,Panos-Bletsos/spark-cost-model-optimizer,icexelloss/spark,bdrillard/spark,mahak/spark,loneknightpy/spark,aray/spark,jiangxb1987/spark,map222/spark,skonto/spark,brad-kaiser/spark,rikima/spark,haowu80s/spark,ericvandenbergfb/spark,metamx/spark,wzhfy/spark,jianran/spark,JoshRosen/spark,ptkool/spark,janewangfb/spark,SHASHANKB/spark,byakuinss/spark,cloud-fan/spark,aray/spark,rednaxelafx/apache-spark,guoxiaolongzte/spark,skonto/spark,SnappyDataInc/spark,apache/spark,darionyaphet/spark,zero323/spark,kimoonkim/spark,joseph-torres/spark,janewangfb/spark,MLnick/spark,WindCanDie/spark,sachintyagi22/spark,aokolnychyi/spark,liutang123/spark,witgo/spark,ahnqirage/spark,ron8hu/spark,big-pegasus/spark,loneknightpy/spark,milliman/spark,ajaysaini725/spark,wangyum/spark,pronix/spark,alunarbeach/spark,esi-mineset/spark,yanboliang/spark,nchammas/spark,HyukjinKwon/spark,lvdongr/spark,rednaxelafx/apache-spark,publicRoman/spark,darionyaphet/spark,jianran/spark,bravo-zhang/spark,lxsmnv/spark,goldmedal/spark,huang1900/spark,panfengfeng/spark,vinodkc/spark,rezasafi/spark,shuangshuangwang/spark,HyukjinKwon/spark,srowen/spark,apache-spark-on-k8s/spark,xuanyuanking/spark,ConeyLiu/spark,rednaxelafx/apache-spark,ahnqirage/spark,narahari92/spark,ibm-research-ireland/sparkoscope,jiangxb1987/spark,wangmiao1981/spark,loneknightpy/spark,caneGuy/spark,jrshust/spark,icexelloss/spark,rezasafi/spark,mdespriee/spark,poffuomo/spark,mahak/spark,dhruve/spark,rikima/spark,brad-kaiser/spark,aray/spark,witgo/spark,rezasafi/spark,poffuomo/spark,aray/spark,eyalfa/spark,Panos-Bletsos/spark-cost-model-optimizer,nilsgrabbert/spark,facaiy/spark,mike0sv/spark,WeichenXu123/spark,adrian-ionescu/apache-spark,andrewor14/spark,ioana-delaney/spark,tejasapatil/spark,Panos-Bletsos/spark-cost-model-optimizer,taroplus/spark,JerryLead/spark,publicRoman/spark,1haodian/spark,publicRoman/spark,apache/spark,kimoonkim/spark,xflin/spark,JerryLead/spark,eyalfa/spark,witgo/spark,mdespriee/spark,saltstar/spark,sureshthalamati/spark,setjet/spark,SnappyDataInc/spark,rekhajoshm/spark,sahilTakiar/spark,maropu/spark,akopich/spark,icexelloss/spark,byakuinss/spark,cloud-fan/spark,chuckchen/spark,caneGuy/spark,JoshRosen/spark,xflin/spark,zzcclp/spark,pronix/spark,esi-mineset/spark,cin/spark,rekhajoshm/spark,cloud-fan/spark,markhamstra/spark,techaddict/spark,ericvandenbergfb/spark,ptkool/spark,gengliangwang/spark,HyukjinKwon/spark,narahari92/spark,dbtsai/spark,rezasafi/spark,techaddict/spark,nilsgrabbert/spark,MLnick/spark,zhouyejoe/spark,jrshust/spark,minixalpha/spark,joseph-torres/spark,ConeyLiu/spark,taroplus/spark,ddna1021/spark,Aegeaner/spark,maropu/spark,metamx/spark,icexelloss/spark,mike0sv/spark,tejasapatil/spark,milliman/spark,techaddict/spark,milliman/spark,big-pegasus/spark,cloud-fan/spark,guoxiaolongzte/spark,cin/spark,maropu/spark,mzl9039/spark,nlalevee/spark,esi-mineset/spark,mdespriee/spark,apache-spark-on-k8s/spark,szhem/spark,publicRoman/spark,sachintyagi22/spark,stanzhai/spark,LantaoJin/spark,1haodian/spark,gengliangwang/spark,Panos-Bletsos/spark-cost-model-optimizer,metamx/spark,kiszk/spark,sureshthalamati/spark,xuanyuanking/spark,1haodian/spark,ptkool/spark,ericvandenbergfb/spark,jkbradley/spark,nchammas/spark,patrick-nicholson/spark,debugger87/spark,vinodkc/spark,highfei2011/spark,lvdongr/spark,hhbyyh/spark,bOOm-X/spark,HyukjinKwon/spark,wangyum/spark,dongjoon-hyun/spark,shuangshuangwang/spark,zhouyejoe/spark,joseph-torres/spark,lvdongr/spark,Panos-Bletsos/spark-cost-model-optimizer,saturday-shi/spark,adrian-ionescu/apache-spark,witgo/spark,pgandhi999/spark,poffuomo/spark,alunarbeach/spark,zhouyejoe/spark,actuaryzhang/spark,UndeadBaneGitHub/spark,rezasafi/spark,loneknightpy/spark,huang1900/spark,facaiy/spark,narahari92/spark,sahilTakiar/spark,dbtsai/spark,apache-spark-on-k8s/spark,pronix/spark,SnappyDataInc/spark,WindCanDie/spark,minixalpha/spark,kiszk/spark,SHASHANKB/spark,yanboliang/spark,huang1900/spark,nchammas/spark,publicRoman/spark,akopich/spark,WeichenXu123/spark,jrshust/spark,metamx/spark,jkbradley/spark,zero323/spark,holdenk/spark,hhbyyh/spark,dhruve/spark,holdenk/spark,ConeyLiu/spark,andrewor14/spark,esi-mineset/spark,cin/spark,byakuinss/spark,ioana-delaney/spark,ericvandenbergfb/spark,szhem/spark,SnappyDataInc/spark,lxsmnv/spark,michalsenkyr/spark,mahak/spark,holdenk/spark,adrian-ionescu/apache-spark,wzhfy/spark,mzl9039/spark,eyalfa/spark,jlopezmalla/spark,maropu/spark,markhamstra/spark,WindCanDie/spark,aokolnychyi/spark,michalsenkyr/spark,mdespriee/spark,ueshin/apache-spark,techaddict/spark,stanzhai/spark,zuotingbing/spark,shuangshuangwang/spark,wangmiao1981/spark,gengliangwang/spark,shuangshuangwang/spark,panfengfeng/spark,yanboliang/spark,big-pe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a1021/spark,rikima/spark,liyichao/spark,Aegeaner/spark,janewangfb/spark,skonto/spark,caneGuy/spark,sachintyagi22/spark,hvanhovell/spark,poffuomo/spark,UndeadBaneGitHub/spark,goldmedal/spark,zero323/spark,Aegeaner/spark,aosagie/spark,vinodkc/spark,sahilTakiar/spark,kevinyu98/spark,haowu80s/spark,alunarbeach/spark,icexelloss/spark,pronix/spark,vinodkc/spark,minixalpha/spark,ueshin/apache-spark,jkbradley/spark,ajaysaini725/spark,jkbradley/spark,markhamstra/spark,akopich/spark,goldmedal/spark,liyichao/spark,srowen/spark,bOOm-X/spark,hhbyyh/spark,stanzhai/spark,skonto/spark,caneGuy/spark,huang1900/spark,zzcclp/spark,setjet/spark,mahak/spark,szhem/spark,someorz/spark,witgo/spark,zuotingbing/spark,liutang123/spark,setjet/spark