[SPARK-21693][R][FOLLOWUP] Reduce shuffle partitions running R worker in few tests to speed up
[SPARK-21693][R][FOLLOWUP] Reduce shuffle partitions running R worker in few tests to speed up

## What changes were proposed in this pull request?

This is a followup to reduce AppVeyor test time. This PR proposes to reduce the number of shuffle partitions to reduce the tasks running R workers in few particular tests.

The symptom is similar as described in `https://github.com/apache/spark/pull/19722`. There are many R processes newly launched on Windows without forking and it makes the differences of elapsed time between Linux and Windows.

Here is the simple comparison for before/after of this change. I manually tested this by disabling `spark.sparkr.use.daemon`. Disabling it resembles the tests on Windows:

**Before**

<img width="672" alt="2017-11-25 12 22 13" src="https://user-images.githubusercontent.com/6477701/33217949-b5528dfa-d17d-11e7-8050-75675c39eb20.png">

**After**

<img width="682" alt="2017-11-25 12 32 00" src="https://user-images.githubusercontent.com/6477701/33217958-c6518052-d17d-11e7-9f8e-1be21a784559.png">

So, this probably will reduce roughly more than 10 minutes.

## How was this patch tested?

AppVeyor tests

Author: hyukjinkwon <gurwls223@gmail.com>

Closes #19816 from HyukjinKwon/SPARK-21693-followup.

taroplus/spark,witgo/spark,rezasafi/spark,Aegeaner/spark,wzhfy/spark,jiangxb1987/spark,techaddict/spark,zzcclp/spark,zzcclp/spark,goldmedal/spark,dbtsai/spark,wangyum/spark,witgo/spark,mahak/spark,rekhajoshm/spark,yanboliang/spark,LantaoJin/spark,wangyum/spark,ioana-delaney/spark,esi-mineset/spark,dongjoon-hyun/spark,nlalevee/spark,kevinyu98/spark,joseph-torres/spark,witgo/spark,wzhfy/spark,tejasapatil/spark,sureshthalamati/spark,pgandhi999/spark,darionyaphet/spark,markhamstra/spark,rikima/spark,dbtsai/spark,tejasapatil/spark,nchammas/spark,zuotingbing/spark,vinodkc/spark,ericvandenbergfb/spark,kevinyu98/spark,JoshRosen/spark,hvanhovell/spark,zero323/spark,adrian-ionescu/apache-spark,tengpeng/spark,ddna1021/spark,rednaxelafx/apache-spark,esi-mineset/spark,WindCanDie/spark,ueshin/apache-spark,Aegeaner/spark,nlalevee/spark,zuotingbing/spark,holdenk/spark,WeichenXu123/spark,zzcclp/spark,cloud-fan/spark,jiangxb1987/spark,hhbyyh/spark,saltstar/spark,ueshin/apache-spark,maropu/spark,hvanhovell/spark,highfei2011/spark,szhem/spark,zero323/spark,guoxiaolongzte/spark,Aegeaner/spark,debugger87/spark,tengpeng/spark,jiangxb1987/spark,adrian-ionescu/apache-spark,ueshin/apache-spark,rekhajoshm/spark,BryanCutler/spark,rikima/spark,caneGuy/spark,milliman/spark,JoshRosen/spark,debugger87/spark,nlalevee/spark,xuanyuanking/spark,techaddict/spark,holdenk/spark,dongjoon-hyun/spark,markhamstra/spark,zuotingbing/spark,szhem/spark,WeichenXu123/spark,zero323/spark,adrian-ionescu/apache-spark,brad-kaiser/spark,ptkool/spark,WindCanDie/spark,lxsmnv/spark,nchammas/spark,kiszk/spark,tejasapatil/spark,apache/spark,vinodkc/spark,esi-mineset/spark,ron8hu/spark,gengliangwang/spark,zhouyejoe/spark,michalsenkyr/spark,dongjoon-hyun/spark,debugger87/spark,ahnqirage/spark,wzhfy/spark,aosagie/spark,chuckchen/spark,WeichenXu123/spark,cloud-fan/spark,ConeyLiu/spark,ConeyLiu/spark,lxsmnv/spark,shaneknapp/spark,chuckchen/spark,wangyum/spark,aosagie/spark,nchammas/spark,BryanCutler/spark,tejasapatil/spark,dongjoon-hyun/spark,spark-test/spark,sureshthalamati/spark,saltstar/spark,ahnqirage/spark,WindCanDie/spark,lxsmnv/spark,milliman/spark,ericvandenbergfb/spark,milliman/spark,kevinyu98/spark,rezasafi/spark,apache/spark,ioana-delaney/spark,sureshthalamati/spark,shaneknapp/spark,srowen/spark,shaneknapp/spark,gengliangwang/spark,dbtsai/spark,chuckchen/spark,ptkool/spark,darionyaphet/spark,rednaxelafx/apache-spark,tengpeng/spark,pgandhi999/spark,rekhajoshm/spark,chuckchen/spark,HyukjinKwon/spark,szhem/spark,wangmiao1981/spark,ioana-delaney/spark,mahak/spark,rekhajoshm/spark,ptkool/spark,sureshthalamati/spark,maropu/spark,michalsenkyr/spark,lvdongr/spark,ericvandenbergfb/spark,aosagie/spark,saltstar/spark,wzhfy/spark,sahilTakiar/spark,spark-test/spark,xuanyuanking/spark,jkbradley/spark,goldmedal/spark,tengpeng/spark,lxsmnv/spark,actuaryzhang/spark,skonto/spark,LantaoJin/spark,bdrillard/spark,pgandhi999/spark,kiszk/spark,ConeyLiu/spark,rezasafi/spark,aosagie/spark,aosagie/spark,taroplus/spark,maropu/spark,skonto/spark,kevinyu98/spark,goldmedal/spark,markhamstra/spark,facaiy/spark,lxsmnv/spark,shuangshuangwang/spark,sahilTakiar/spark,tengpeng/spark,hhbyyh/spark,BryanCutler/spark,shaneknapp/spark,dongjoon-hyun/spark,eyalfa/spark,xuanyuanking/spark,darionyaphet/spark,vinodkc/spark,brad-kaiser/spark,highfei2011/spark,zhouyejoe/spark,jkbradley/spark,WindCanDie/spark,BryanCutler/spark,kiszk/spark,icexelloss/spark,ericvandenbergfb/spark,ron8hu/spark,michalsenkyr/spark,esi-mineset/spark,wangmiao1981/spark,debugger87/spark,JoshRosen/spark,nlalevee/spark,WeichenXu123/spark,srowen/spark,actuaryzhang/spark,jkbradley/spark,bdrillard/spark,caneGuy/spark,nlalevee/spark,xuanyuanking/spark,JoshRosen/spark,ueshin/apache-spark,eyalfa/spark,facaiy/spark,mdespriee/spark,taroplus/spark,yanboliang/spark,kiszk/spark,esi-mineset/spark,eyalfa/spark,maropu/spark,rezasafi/spark,techaddict/spark,szhem/spark,maropu/spark,rednaxelafx/apache-spark,BryanCutler/spark,pgandhi999/spark,brad-kaiser/spark,bravo-zhang/spark,zuotingbing/spark,icexelloss/spark,wangmiao1981/spark,xuanyuanking/spark,markhamstra/spark,ConeyLiu/spark,ueshin/apache-spark,sureshthalamati/spark,wangmiao1981/spark,HyukjinKwon/spark,dbtsai/spark,mdespriee/spark,facaiy/spark,sureshthalamati/spark,witgo/spark,apache/spark,mdespriee/spark,shaneknapp/spark,hhbyyh/spark,kiszk/spark,tejasapatil/spark,dongjoon-hyun/spark,jkbradley/spark,mdespriee/spark,shuangshuangwang/spark,cloud-fan/spark,jkbradley/spark,caneGuy/spark,milliman/spark,lvdongr/spark,ddna1021/spark,LantaoJin/spark,goldmedal/spark,rekhajoshm/spark,cloud-fan/spark,ron8hu/spark,BryanCutler/spark,zero323/spark,dbtsai/spark,gengliangwang/spark,joseph-torres/spark,spark-test/spark,jkbradley/spark,highfei2011/spark,mahak/spark,highfei2011/spark,nchammas/spark,sahilTakiar/spark,ericvandenbergfb/spark,chuckchen/spark,icexelloss/spark,Aegeaner/spark,gengliangwang/spark,goldmedal/spark,HyukjinKwon/spark,Aegeaner/spark,darionyaphet/spark,JoshRosen/spark,bdrillard/spark,chuckchen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