test: remove unused variables from HTTPS tests

PR-URL: https://github.com/nodejs/node/pull/4426
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>

test/parallel/test-https-truncate.js

@@ -9,7 +9,6 @@ if (!common.hasCrypto) {
 var https = require('https');
 
 var fs = require('fs');
-var path = require('path');
 
 var key = fs.readFileSync(common.fixturesDir + '/keys/agent1-key.pem');
 var cert = fs.readFileSync(common.fixturesDir + '/keys/agent1-cert.pem');