Propagate status in deleteAndVerifyContainerGone

Consuming the result of deleteContainerIfEmpty avoids an eventual
issue with Swift containers.  Also backfill some tests for
deleteContainerIfEmpty.  Fixes JCLOUDS-420.
JCLOUDS-416. Add TemplateOptions#networks.

- Adds networks field/methods to TemplateOptions.
- Adds them to children as well for legacy reasons.
- Deprecates CloudStackTemplateOptions#networkIds methods in favor of #networks.
- TODO: Modify compute abstraction layer for provisioning for nova,
    EC2, et al to take advantage of this.
Cleaning up nodeNames/networks copy-paste mixup in CloudSigmaTemplateOptions
Cleaning up nodeNames/networks copy-paste mixup in EC2TemplateOptions as well
Added OkHttp driver to support modern HTTP verbs