Spark configuration and tests from parsnip

[topepo]

This is to move spark testing out of parsnip.

Currently not testing on Windows, only macOS. Fails with error:

> ## -----------------------------------------------------------------------------
> 
> library(sparklyr)

Attaching package: 'sparklyr'

The following object is masked from 'package:purrr':

    invoke

> 
> if (.Platform$OS.type == "windows") {
+   spark_install_winutils("2.4")
+   sparklyr::spark_install(verbose = TRUE, version = "2.4", hadoop_version = "2.7")
+ } else {
+   sparklyr::spark_install(verbose = TRUE, version = "2.4")
+ }
Installing winutils...
trying URL 'https://github.com/steveloughran/winutils/raw/master/hadoop-2.6.0/bin/winutils.exe'
Content type 'application/octet-stream' length 108032 bytes (105 KB)
==================================================
downloaded 105 KB

Installed winutils in C:\Users\runneradmin\AppData\Local\spark\spark-2.4-bin-hadoop2.7\tmp\hadoop\bin\winutils.exe
Installing Spark 2.4.5 for Hadoop 2.7 or later.
Downloading from:
- 'https://archive.apache.org/dist/spark/spark-2.4.5/spark-2.4.5-bin-hadoop2.7.tgz'
Installing to:
- 'C:\Users\runneradmin\AppData\Local/spark/spark-2.4.5-bin-hadoop2.7'
trying URL 'https://archive.apache.org/dist/spark/spark-2.4.5/spark-2.4.5-bin-hadoop2.7.tgz'
Content type 'application/x-gzip' length 232530699 bytes (221.8 MB)
==================================================
downloaded 221.8 MB

Installation complete.
> 
> sc <- try(sparklyr::spark_connect(master = "local"), silent = TRUE)
> 
> if(inherits(sc, "try-error")) {
+   print(sc)
+ }
[1] "Error : \n\nTo run Spark on Windows you need a copy of Hadoop winutils.exe:\n\n1. Download Hadoop winutils.exe from:\n\n   https://github.com/steveloughran/winutils/raw/master/hadoop-2.6.0/bin/\n\n2. Copy winutils.exe to C:\\Users\\runneradmin\\AppData\\Local\\spark\\spark-2.4.5-bin-hadoop2.7\\tmp\\hadoop\\bin\n\nAlternatively, if you are using RStudio you can install the RStudio Preview Release,\nwhich includes an embedded copy of Hadoop winutils.exe:\n\n  https://www.rstudio.com/products/rstudio/download/preview/\n\n\n"
attr(,"class")
[1] "try-error"
attr(,"condition")
<simpleError: 

To run Spark on Windows you need a copy of Hadoop winutils.exe:

1. Download Hadoop winutils.exe from:

   https://github.com/steveloughran/winutils/raw/master/hadoop-2.6.0/bin/

2. Copy winutils.exe to C:\Users\runneradmin\AppData\Local\spark\spark-2.4.5-bin-hadoop2.7\tmp\hadoop\bin

Alternatively, if you are using RStudio you can install the RStudio Preview Release,
which includes an embedded copy of Hadoop winutils.exe:

  https://www.rstudio.com/products/rstudio/download/preview/

>

I'll continue to work on it. Perhaps @javierluraschi could take a another look.