8157816: Mark 4 httpclient tests as intermittently failing

Reviewed-by: chegar

jdk/test/java/net/httpclient/SplitResponse.java

@@ -33,6 +33,7 @@ import java.util.concurrent.CompletableFuture;
 /**
  * @test
  * @bug 8087112
+ * @key intermittent
  * @build Server
  * @run main/othervm -Djava.net.HttpClient.log=all SplitResponse
  */

jdk/test/java/net/httpclient/http2/BasicTest.java

@@ -24,6 +24,7 @@
 /*
  * @test
  * @bug 8087112
+ * @key intermittent
  * @library /lib/testlibrary
  * @build jdk.testlibrary.SimpleSSLContext
  * @modules java.httpclient

jdk/test/java/net/httpclient/http2/ErrorTest.java

@@ -24,6 +24,7 @@
 /*
  * @test
  * @bug 8157105
+ * @key intermittent
  * @library /lib/testlibrary
  * @build jdk.testlibrary.SimpleSSLContext
  * @modules java.httpclient

jdk/test/java/net/httpclient/http2/TLSConnection.java

@@ -39,6 +39,7 @@ import javax.net.ssl.SSLSession;
 /*
  * @test
  * @bug 8150769 8157107
+ * @key intermittent
  * @summary Checks that SSL parameters can be set for HTTP/2 connection
  * @modules java.httpclient
  * @compile/module=java.httpclient java/net/http/Http2Handler.java