Feature: Support to set single quota for multipath in tireStore.level in Jindoruntime #4476
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By design, users could set multiple cache paths when configuring tiredStore for the runtime, and there were two ways to set quotas for multiple cache paths.
The first method was to set corresponding quotas for each of the cache paths via level.quotaList.
The second method was to set a total quota for all cache paths via level.quota, where each path would receive a quota equal to the total quota divided by the number of cache paths, which is equivalent to the following configuration.
The final effective quota configuration of the two configuration examples above is equivalent.
However, currently not all runtimes support the second method; only the alluxio runtime does.
Therefore, in this PR, support for this type of quota configuration is added for the jindoruntime, and a common function to process the tiredStore is provided for three jindoruntime.Engines(jindo,jindofsx,jindocache).