Kubernetes V1Controller Cleanup

[surahman]

There are no functional changes in this PR. I have added all the outstanding Javadocs to the methods in the V1Controller and relocated

incubator-heron/heron/schedulers/src/java/org/apache/heron/scheduler/kubernetes/V1Controller.java

Lines 933 to 936 in fd30626

	public static double roundDecimal(double value, int places) {
	double scale = Math.pow(10, places);
	return Math.round(value * scale) / scale;
	}

to the more appropriate KubernetesUtils class.

Resolves #3707, #3723, #3747.