revert(HttpClientSingleton): Revert SSL change here: https://github.com/watson-developer-cloud/java-

Author: lpatino10

src/main/java/com/ibm/cloud/sdk/core/http/HttpClientSingleton.java

@@ -186,8 +186,8 @@ private void setupTLSProtocol(final OkHttpClient.Builder builder) {
 
       X509TrustManager trustManager = (X509TrustManager) trustManagers[0];
 
-      System.setProperty("com.ibm.jsse2.overrideDefaultTLS", "true");
-      SSLContext sslContext = SSLContext.getInstance("TLSv1.2");
+      // On IBM JDKs this gets only TLSv1
+      SSLContext sslContext = SSLContext.getInstance("TLS");
 
       sslContext.init(null, new TrustManager[] { trustManager }, null);
       SSLSocketFactory sslSocketFactory = new DelegatingSSLSocketFactory(sslContext.getSocketFactory()) {