specify unidocGenjavadocVersion of 0.8
specify unidocGenjavadocVersion of 0.8

Fixes an issue with being too strict generating javadoc causing errors.

Author: Holden Karau <holden@pigscanfly.ca>

Closes #2893 from holdenk/SPARK-3359-sbtunidoc-java8 and squashes the following commits:

9379a70 [Holden Karau] specify unidocGenjavadocVersion of 0.8

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