Improve SpringApplicationAdminMXBean to expose additional information:

* Whether the application uses an embedded container
* The properties exposed by the `Environment`

This allows to know if the application is web-based and the HTTP port
on which it is running.

Closes gh-3067

Previously, the actual HTTP port on which a web application is running on
was only exposed in tests. This commit makes sure to provide that feature
regardless of the environment so that applications can know on which port
they are actually running on.

If there are several containers, each is exposed via the namespace of
their respective application context.

Closes gh-3259

See gh-2900

* metrics2:
  Remove duplicate code in new metrics code

Refactor BufferMetricReader, CounterBuffers and GaugeBuffers to reduce
duplicate code.

Closes gh-3117

* codahale:
  Change Codahale to Dropwizard in Javadoc.

* gh-3105:
  Remove deprecated SimpleMongoDbFactory call

Update MongoAutoConfiguration to create a `MongoClient` bean rather than
`Mongo` and update `MongoDataAutoConfiguration` to remove the call to
the deprecated `SimpleMongoDbFactory`.

Fixes gh-3105
Closes gh-3126

Add a new `spring.mvc.async.request-timeout` property which can be used
to configure AsyncSupportConfigurer.setDefaultTimeout(..).

Fixes gh-2900
Closes gh-3236

* pull3245:
  Upgrade joda-time to 2.8.1

Fixes gh-3238
Closes gh-3245

* ehcache:
  Polish
  Fix EhCache hit/miss ratio

The hitRatio is the ratio of two windowed rates that are calculated
independently. They are not updated or read transactionally, hence the
ratio of the two can drift slightly from what might be expected.

We now make sure that the hit or miss ratio can't be higher than 1

Closes gh-3235

* hornetq-typos:
  Fix typos

Closes gh-3247

Create an EmbeddedVelocityToolboxView which supports loading toolbox.xml
files from the application classpath as well as the ServletContext. The
VelocityAutoConfiguration class has been updated to use the new view.

This change allows the `spring.velocity.toolbox-config-location`
property to work with embedded servlet containers.

Fixes gh-2912

Update EntityScanRegistrar so that multiple @EntityScan annotations can
be used with a single application. Previously, when an application used
multiple annotations only the first one found would get applied. This
changes alters that to augment the packages that will be scanned.

Fixes gh-2757

Update appendix example to use the more common `/var/log` folder rather
than `/var/logs`.

Fixes gh-3225

Previously, the VcapApplicationListener would discard any service
credential value that wasn't a String, Number, Map, Collection, or
null.  This was particularly a problem for services that exposed a
value as a JSON boolean.  This change takes booleans in the credential
payload into account, converting them to Strings so that they will
pass through the properties system properly.  There's no real downside
to this as Spring will coerce them back into Booleans if needed, by
the application.

Fixes gh-3237

Fixes gh-3209

Closes gh-3206

Closes gh-3207

CacheConfigFileCondition was not properly tested, leading to various
potential source of errors (that last one being gh-3233). This condition
is now tested properly.

See gh-3232

This is related to 38cca9c1 but for the Rabbit support. Update
RabbitAnnotationDrivenConfiguration to only associate a JTA transaction
manager, if any.

Closes gh-3222

* cache-config:
  Fix typo in cache auto-configurations