Ignore container's auto-startup once the context is refreshed.

Issue: SPR-14015

* pr/1027:
  Fix typo

Closes gh-1027

Issue: SPR-14108

Issue: SPR-14097

Issue: SPR-14110

Issue: SPR-14109

Issue: SPR-14104

Issue: SPR-14100

This commit documents the @Ignore'd test to explain that Spring does not
support a hybrid approach for annotation attribute overrides with
transitive implicit aliases.

Issue: SPR-13554

Issue: SPR-11106

Includes consistent applicability of class-level metadata to user-level methods only.

Issue: SPR-14017
Issue: SPR-14095

Issue: SPR-14095

Issue: SPR-13475

Issue: SPR-13973

OkHttp3 introduces a new package and API that is incompatible with
previous versions. This commit adds a new
OkHttp3ClientHttpRequestFactory and supporting classes.

This commit reverts the recently added merged annotation support for
Spring's JMX annotations by once again using the simpler searches for
repeatable annotations in AnnotationUtils.

Issue: SPR-13973

Prior to this commit, the `HttpInvokerServiceExporter` would close
its `ObjectOutputStream`, which itself issues duplicate flushes on the
underlying `OutputStream`. Duplicate flushes can lead to multiple,
separate TCP packets where those should be gathered writes.

This commit wraps the underying stream with a decorator that guards
against flush calls that are duplicated with the one done in `close`.

Issue: SPR-14040

Prior to this commit, HTTP clients relying on the JDK HTTP client would
not properly reuse existing TCP connections (i.e. HTTP 1.1 persisten
connection). The SimpleClientHttpResponse would close the actual connection once the
response is handled.

As explained in the JDK documentation
(http://docs.oracle.com/javase/8/docs/technotes/guides/net/http-keepalive.html)
HTTP clients should do the following to allow resource reuse:

* consume the whole HTTP response content
* close the response inputstream once done

This commit makes sure that the response content is
totally drained and then the stream closed (and not the connection).

Issue: SPR-14040

Issue: SPR-14089

Issue: SPR-14093

Issue: SPR-14094

Issue: SPR-14091

Issue: SPR-13973

Issue: SPR-14017

Issue: SPR-13973

Issue: SPR-13973

Prior to this commit, binding a `@ModelAttribute` object as a Controller
handler paramater would instantiate the object and set all its
properties, fetching data from the request. When no data is available,
the WebDataBinder tries to bind default "empty" values:
* Boolean.FALSE for boolean types
* empty arrays for array types
* null by default

This commit adds the new default empty values:
* empty Collections for Collection types
* empty Maps for Map types

Rather than using empty implementations provided by `Collections.empty`
(which are not mutable), we're using the closest possible target type
and real implementations, provided by the `CollectionFactory`.

Issue: SPR-13502

Issue: SPR-13973

Update methods in TestPropertySourceUtils to accept var-args and allow
addInlinedProperties to be called more than once.

Issue: SPR-14088

This commit introduces a boolean alwaysProcesses() method in the
Processor API which allows for simplification across all search
algorithms within AnnotatedElementUtils.

Specifically, it is no longer necessary for process() methods to verify
that the supplied annotation is actually the sought target annotation.

In addition, duplicated code has been extracted into common methods
(e.g., hasMetaAnnotationTypes()) and common Processor implementations
(e.g., AlwaysTrueBooleanAnnotationProcessor).

Issue: SPR-13973

Issue: SPR-13973