Check TLS 1.3 session for ticket before saving to Java cache

[cconlon]

This PR makes one change in native JNI code when getting and returning the native WOLFSSL_SESSION object to be stored into the Java session cache.

If the connection is using TLS 1.3, only return and store the session if we have the ticket. Otherwise, we may return an incomplete session object which may cause subsequent resumption attempts to fail.

This issue shows up in our ant tests when native wolfSSL is configured with:

cd wolfssl
./autogen.sh
./configure --enable-jni --enable-all

cd wolfssljni
./java.sh
ant
ant test

cat build/reports/TEST-com.wolfssl.provider.jsse.test.WolfSSLJSSETestSuite.txt

...
Testcase: testReuseSession took 0.012 sec
	FAILED
failed to create engine
junit.framework.AssertionFailedError: failed to create engine
	at com.wolfssl.provider.jsse.test.WolfSSLEngineTest.testReuseSession(WolfSSLEngineTest.java:539)
...