Remote InboundInvocationHandler should differentiate between various cache inavailabilities

Currently a RequestIgnoredResponse is returned to any caller if either of these happen:

• The cache is not yet started, is in the process of starting, and times out.
• The cache doesn't exist.
• The cache has been stopped.

The latter two should use a different response type - CacheUnavailableResponse ? - that would not trigger a retry or any abort of transactions.