Packetbeat 0.4.2

Change log:

• Added more flexibility into which HTTP headers are captured and indexed. You can now index all headers, a white list of headers or no headers. By default no headers are sent, which matches the default behaviour in 0.4.1 as well. See the http configuration section for how to define which headers to capture and index.
• Added the option to split the Cookie and Set-Cookie headers into individual key-values pairs. This makes it easier to search for a particular session-id cookie, for example.
• Added the option of specifying a header field to be used for computing the country of the request. For example, one can use the X-Forwarded-For header field to extract the real ip and the src_country fields to be used for the map widget in Kibana.
• Fixed a bug in which the process detection code was called on each transaction rather than periodically.