spark git commit: [SPARK-25572][SPARKR] test only if not cran

Repository: spark Updated Branches: refs/heads/master f246813af -> f4b138082 [SPARK-25572][SPARKR] test only if not cran ## What changes were proposed in this pull request? CRAN doesn't seem to respect the system requirements as running tests - we have seen cases where SparkR is run on Java

spark git commit: [SPARK-25572][SPARKR] test only if not cran

Repository: spark Updated Branches: refs/heads/branch-2.4 a14306b1d -> fef30271b [SPARK-25572][SPARKR] test only if not cran ## What changes were proposed in this pull request? CRAN doesn't seem to respect the system requirements as running tests - we have seen cases where SparkR is run on