DOCS-24. Integration tests for tutorial code.

* Move input data and layout files to src/main/resources/phonebook.
* Update assembly configuration to copy those to the root of the tarball.

* Test that JSON and DDL layouts for phonebook table both work,
  and are equivalent.
* Test that StandaloneImporter properly imports to HBase.
* Test that PhonebookImporter (MR-based) properly imports to HBase.