private void deleteCachedDistFiles(File distDir,
									   List<File> distFiles,
									   Set<String> distFilesDigest,
									   List<Set<String>> agentCachedDistFilesDigestList) {
		Set<String> cachedDistFilesDigest = extractCachedDistFilesDigest(distFilesDigest, agentCachedDistFilesDigestList);

		distFiles
			.stream()
			.filter(file -> cachedDistFilesDigest.contains(getFileDigest(distDir, file)))
			.forEach(FileUtils::deleteQuietly);
	}
Delete cached distribution files, These are already in the agent cache directory.

@param distDir						   Directory containing files to be distributed for testing.
@param distFiles 					   Required files for currently running test.
@param distFilesDigest				   Required file's digest for currently running test.
@param agentCachedDistFilesDigestList   Digest of files in each agent cache directory.
ngrinder-controller/src/main/java/org/ngrinder/perftest/service/PerfTestRunnable.java