[SPARK-23285][K8S] Allow fractional values for spark.executor.cores#20460

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liyinan926 wants to merge 4 commits intoapache:masterfrom

liyinan926:master

Commits on Jan 31, 2018

Commits on Feb 1, 2018

Fixed check in SparkConf
liyinan926
committed

Commits on Feb 2, 2018

Also allow spark.task.cpus to have fractional values
liyinan926
committed