Initial release features support for Hdfs

[silkentrance]

As a test developer I need to have a working Hdfs instance. While I do not need direct access to that instance, it should be available for integration with other Hadoop components.

I want to be able to configure the Hdfs instance by means of annotating the test class.

When running tests in parallel, I want the system to not start multiple Hdfs instances for a specific test class or a suite of test classes that derive from a common super class which provides the Hdfs configuration. Instead, all of these threads must share the same instance. In effect, there is only one Hdfs instance that is shared across all threads.

Running the same tests on the same system from multiple processes must not lead to failing tests. Individual instances of Hdfs must have their own ports. The ports must be determined automatically.

In addition I want to be able to access the Filesystem by means of both parameter and field injection.

Acceptance criteria

• Hdfs is provided
• Hdfs instances can be configured via annotation on ElementType.TYPE level
• There is only one Hdfs instance that is shared across multiple threads
• The effective Hdfs instance configuration is used for configuring other provided components
• Hdfs instances use dedicated free ports that have been determined automatically
• Filesystem can be injected into both fields and parameters