Adding Javadocs comments to the different tests for OVSDB library and plugins.

Removing redundant test_schema.json, which is already available in the resources directory.

Change-Id: I914da1dcb761b60bf9bd56b33abb90d67f73a186
Signed-off-by: Srini Seetharaman <srini.seetharaman@gmail.com>
Merge "Adding Javadocs comments to the different tests for OVSDB library and plugins."