Eventually it would be nice to move this out into a proper generator with enums to
save space, but as users may have extended CoreWorkload and could be using the
"operationchooser" field, we'll just break it out into a static function so as to
avoid breaking anyone's code.

[googlebigtable] Add a Google Bigtable binding for testing load using

the native Protobuf GRPC based API.

[elasticsearch] Fix race condition

This commit fixes a race condition that exists between the shards being
ready to serve requests and the execution of the workload.

[elasticsearch] Elasticsearch improvements

This commit fixes an issue with the index creation logic when the
elasticsearch.newdb flag is set to true. Namely, when running in local
mode the index would never exist (since the node always starts with a
clean temporary directory) but with elasticsearch.newdb an attempt would
be made to delete the index which would cause the workload to fail.

This commit also does a cleanup of the index creation logic using an
explicit create index request and passing the index settings along as
part of that index creation.

Update cassandra2-cql driver to only run tests on jdk8

[cassandra] properly clear cached containers.

clear containers before we use them rather than after, so that in the case of
exceptions we can recover.

closes #127

[S3] Close opened S3Object

[hbase10] Fix the init() method to properly construct a single…

object. Previously N objects were instantiated because the method didn't
check to see if the connection was null.

[core] Add a UnixEpochTimestampGenerator

[dynamodb] Checkstyle updates for DynamoDB.

[geode] Checkstyle updates for Apache Geode (incubating)

[tarantool] Checkstyle updates for the Tarantool binding.

[infinispan] Checkstyle updates for the Infinispan binding.

[core] Add byte to double and long conversion methods to Utils.

These will be used for #653 to write timestamps and numeric values
to the ByteIterator maps.

Fixes #612.

S3Object opened in getS3ObjectAndMetadata() should be closed.