add limitoverwrites option per bucket (#466)

- Feature: Added global zenserver option `--cache-bucket-limit-overwrites` controlling Whether to require policy flag pattern before allowing overwrites or not. Default `false` = overwrites always allowed
- Feature: Add per bucket cache configuration option `limitoverwrites` (Lua options file only)

        cache = {
            bucket = {  -- This is the default for all namespaces
                limitoverwrites = true
            },
            buckets = { -- Here you can add matching per bucket name (matches accross namespaces)
                iostorecompression = {
                  limitoverwrites = false
                },
            },
        }

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