Switch to native HttpClient in Olog ES

[georgweiss]

The notion of request filters supported in Jersey seems to be missing from the native APIs. In the case of the Olog client this means:

• Permissive host name settings is implemented through call to System.getProperties().setProperty(). Unfortunately I do not have a setup to verify that this works.
• The debugging filter would be replaced by JVM options, see jdk.httpclient.HttpClient.log. Sadly that does not provide the same functionality: request/response body not logged even at highest debug level settings.
• Authentication filter based on username/password from properties file I have removed as I (erroneously?) see it as legacy and not needed.

[shroffk]

Looks good

I think I might have to add some more flexible hostname verification