Improve ConfigurationDB.java

[inonwir]

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The code to be improved is copy(File src, File dst) in https://github.com/SCADA-LTS/Scada-LTS/blob/develop/src/br/org/scadabr/db/configuration/ConfigurationDB.java Line#14-#25.

Type of Recommendation: Improve copy Method with Robust Resource Management and Performance Enhancement

Based on the comment by @Limraj :
It is better to use try-with-resources construct:

	public static void copy(File src, File dst) throws IOException {
		try(InputStream in = new FileInputStream(src); 
                    OutputStream out = new FileOutputStream(dst)) {
			byte[] buf = new byte[2048];
			int len;
			while ((len = in.read(buf)) > 0) {
				out.write(buf, 0, len);
			}
		}
	}

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