Force the connections in wiremock tests to be closed.
See https://github.com/tomakehurst/wiremock/issues/485

As Spring Boot 1.4.x and older doesn't use the vendor content-type for
the actuator endpoints, we also need to consider application/json
responses for the legacy conversion

fixes #749

Setting a loglevel for logger names with spaces currently fails because
the servlet.InstanceProxyController messes with the encoding. With this
commit the path is correctly encoded before being forwarded.

fixes #755

This makes sure that the headers are written to the output stream
before the async dispatch. Otherwise we end up with strange NPEs
when flushing the buffer on writing the body.

fixes #715

..to gain more performance and reduce gc pressure

fixes #713

closes #713

Fixes stalls in threaddump view due to not completing responses - only
reactive applications were affected so far.

If the build version of the instance is present in the metadata it's now
also considered and the version is now a attribute on the instance
itself. So when using non-boot application they can provide it via the
registration metadata.

The WebClient's responses should be always consumed, so that underlying
buffers are released.

Fixes #666

This commit enables client and server to work out of the box on
CloudFoundry.
The client derives the registration info (url and metadata) from the
VCAP environment variables.
The server computes a unique instanceId and the correct headers for the
cf router based on the metadata provided by instances. Also suppots the
CloudFoundry discovery client ootb.

closes #434

... to support multiple HttpHeadersProviders

closes #560

Don't output metadata in Registration.toString()

... to prevent registration of the controller from standard spring
mechanisms