Insert deprecation warnings and some minor refactoring

test/commands/getset.spec.js

@@ -33,7 +33,6 @@ describe("The 'getset' method", function () {
                 });
 
                 it("reports an error", function (done) {
-                    client.GET(key, redis.print); // Use the utility function to print the error
                     client.get(key, function (err, res) {
                         assert(err.message.match(/The connection has already been closed/));
                         done();