fix: 修复当lifetime传入为负数时，会导致证书安装不成功的bug

test.cert

@@ -1,15 +1,15 @@
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utils/NDNCertificationUtil.cpp

@@ -57,10 +57,12 @@ int NDNCertificationUtil::installCert(const std::string &certStr, long lifetime,
     if (!forceUpdate && redisUtil.exist(cert.getName().toUri()) > 0) {
         return -2;
     }
-    std::cout << cert.getName() << std::endl;
+    std::cout << cert.getName() << " => " << certStr << std::endl;
     int result = redisUtil.set(cert.getName().toUri(), certStr) ? 0 : -3;
-    std::cout << "setLifetime: " << lifetime << std::endl << "result: "
-              << redisUtil.setLifeTime(cert.getName().toUri(), lifetime) << std::endl;
+    if (lifetime > 0) {
+        std::cout << "setLifetime: " << lifetime << std::endl << "result: "
+                  << redisUtil.setLifeTime(cert.getName().toUri(), lifetime) << std::endl;
+    }
     return result;
 }