[4.x] Tls.equals can throw a NPE if alorithm contstraints is null

[tomas-langer]

see title

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Caused by: java.lang.NullPointerException: Cannot invoke "java.security.AlgorithmConstraints.equals(Object)" because the return value of "javax.net.ssl.SSLParameters.getAlgorithmConstraints()" is null
        at io.helidon.common.tls.Tls.equals(Tls.java:290)
        at io.helidon.common.tls.Tls.equals(Tls.java:168)
        at java.base/java.util.Objects.equals(Objects.java:64)
        at io.helidon.webclient.api.ConnectionKey.equals(ConnectionKey.java:36)
        at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1721)
        at io.helidon.webclient.http1.Http1ConnectionCache.keepAliveConnection(Http1ConnectionCache.java:130)
        at io.helidon.webclient.http1.Http1ConnectionCache.connection(Http1ConnectionCache.java:77)
        at io.helidon.webclient.http1.Http1CallChainBase.obtainConnection(Http1CallChainBase.java:296)
        at io.helidon.webclient.http1.Http1CallChainBase.proceed(Http1CallChainBase.java:137)
        at io.helidon.webclient.api.ClientRequestBase.invokeServices(ClientRequestBase.java:395)
        at io.helidon.webclient.http1.Http1ClientRequestImpl.invokeWithServices(Http1ClientRequestImpl.java:205)
        at io.helidon.webclient.http1.Http1ClientRequestImpl.doOutputStream(Http1ClientRequestImpl.java:126)
        at io.helidon.webclient.http1.Http1ClientRequestImpl.doOutputStream(Http1ClientRequestImpl.java:37)
        at io.helidon.webclient.api.ClientRequestBase.outputStream(ClientRequestBase.java:273)
        at io.helidon.webclient.api.HttpClientRequest.doOutputStream(HttpClientRequest.java:84)
        at io.helidon.webclient.api.ClientRequestBase.outputStream(ClientRequestBase.java:273)
        at io.helidon.jersey.connector.HelidonConnector.apply(HelidonConnector.java:255)
        at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:300)
        ... 70 more