Allow Cache configuration to be more dynamic

[stroomdev10]

Currently caches can only be configured at startup.

It would be useful to allow an admin to modify the cache configuration. e.g. TTI times or max size

[at055612]

Should be doable but will mean the cache would have to be recreated using the new settings, i.e. clearing the cache. The cache screen would probably need some kind of re-build icon at the cluster and node levels, which would recreate the cache using the currently configured settings.

This would mean a fair bit of refactoring of each place in the code that uses a cache to allow the cache to be mutated, so non-trivial.

[at055612]

Fixed in >7.0.2