The `protected` parameter will be used to signify that we should
never purge a release in FAILED status. You can specify the
`continue_processing` param to either skip the failed release and
continue on, or to halt armada execution immediately.
- Add protected param to Chart schema and documentation.
- Implement protection logic.
- Moved purging of FAILED releases out of pre-flight and into sync
for finer control over protected params. This means failed
releases are now purged one at a time instead of all up front.
- Added purge and protected charts to final client `msg` return.
- Fix: Added missing dry-run protection in tiller delete resources.
Change-Id: Ia893a486d22cc1022b542ab7c22f58af12025523
6546139155