Fix java version parsing in SparkR on Windows

  java version "1.8.0_144"
  Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
  Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)
  Picked up _JAVA_OPTIONS: -XX:-UsePerfData 
  -- 1. Error: create DataFrame from list or data.frame (@test_basic.R#21)  ------
  subscript out of bounds
  1: sparkR.session(master = sparkRTestMaster, enableHiveSupport = FALSE, sparkConfig = sparkRTestConfig) at D:/temp/RtmpIJ8Cc3/RLIBS_3242c713c3181/SparkR/tests/testthat/test_basic.R:21
  2: sparkR.sparkContext(master, appName, sparkHome, sparkConfigMap, sparkExecutorEnvMap, 
         sparkJars, sparkPackages)
  3: checkJavaVersion()
  4: strsplit(javaVersionFilter[[1]], "[\"]")