The original Aerospike interface layer was created when the REPLACE_ONLY option was not available.  This provides a policy more in line with the policies that other databases have implemented their interface layers.

- define checkstyle configs in as few places as possible
- use checkstyle:check since it has defaults that match what we want (fail after logging to console)
- modules that have current failures set property checkstyle.failOnViolation to false.

Replaces numeric status codes with a canonical set of Status objects,
each with a short name and description.
Bindings with more specific errors (e.g., timeouts) return additional
statuses.

This changes the default output from messages like:

   [UPDATE], Return=0, 511

To:

   [UPDATE], Return=OK, 511

* Added a package-info.java.
* Added JavaDoc for the binding's DB implementation.