Loggers#getLogger static method to take into account the logger prefix

Improved LoggingListener (which reads and applies @TestLogging annotation) to take into account the logger prefix. We can now use the @TestLogging annotation and specify either the whole package name (e.g. o.e.action.metadata) or only the package name without the logger prefix (action.metadata), the custom log level will be properly applied in both cases
Rare race condition when introducing new fields into a mapping
Dynamic mapping allow to dynamically introduce new fields into an existing mapping. There is a (pretty rare) race condition, where a new field/object being introduced will not be immediately visible for another document that introduces it at the same time.

closes #3667, closes #3544
Reverting change in bin/plugin due to d3980ee184f11efcbd2b38421f4946de9198fe20 commit
Collapse test.{unit,integration} into org.elasticsearch.
Fix misspellings.
fixed typo in javadoc
Added 'IntegrationTests' annotation to filter integration tests

Tests now support ignoring integartion tests by passing
'-Dtests.integration=false' to the test runner either via IDE or
maven to only run fast unittests.
Add -Dtests.integration support to pom.xml
Add support for Lucene's MockDirectoryWrapper

MockDirectoryWrapper adds asserting logic to the low level directory
implementation that helps to track and catch resource leaks like
unclosed index inputs caused by dangling IndexReader or IndexSearcher
instances. It prevents double writes to files and allows low level
random exceptions to be thrown for testing index consistency etc.

Closes #3654
Set log level to trace for package action.support.broadcast in the RecoveryPercolatorTests#testSinglePercolator_recovery test.
Moved to use assertHitCount instead of just checking the total count
If all scroll ids should be removed then the `_all` value should be used instead of not specifying any scroll ids.
Fix typo

Thanks to @ybonnel for finding it ;-)