test: refactor all tests that depends on crypto

we had a few ways versions of looking for support before executing a test. this
commit unifies them as well as add the check for all tests that previously
lacked them. found by running `./configure --without-ssl && make test`. also,
produce tap skip output if the test is skipped.

PR-URL: https://github.com/iojs/io.js/pull/1049
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Shigeki Ohtsu <ohtsu@iij.ad.jp>

test/parallel/test-https-truncate.js

@@ -1,8 +1,13 @@
 var common = require('../common');
 var assert = require('assert');
 
-var fs = require('fs');
+if (!common.hasCrypto) {
+  console.log('1..0 # Skipped: missing crypto');
+  process.exit();
+}
 var https = require('https');
+
+var fs = require('fs');
 var path = require('path');
 
 var resultFile = path.resolve(common.tmpDir, 'result');