HostnameVerifier in HttpClientBuilder is ignored when HttpClientUtil creates connection

In SolrHttpClientBuilder, we can configure a lot of things including HostnameVerifier.

We have code like below:

HttpClientUtil.setHttpClientBuilder(new CommonNameVerifierClientConfigurer());

CommonNameVerifierClientConfigurer will set our own HostnameVerifier which checks subject dn name.

But this doesn't work as when we create SSLConnectionSocketFactory at HttpClientUtil.DefaultSchemaRegistryProvider.getSchemaRegistry() we don't check and use HostnameVerifier in SolrHttpClientBuilder at all.

The fix would be very simple, at HttpClientUtil.DefaultSchemaRegistryProvider.getSchemaRegistry, if HostnameVerifier in SolrHttpClientBuilder is not null, use it, otherwise same logic as before.