Remove sharding strategy options

[pstibrany]

Components that use ring for sharding often have option to use two different sharding strategies: "default" and "shuffle-sharding".

I propose to drop support for "default" strategy in the configuration and code. When using shuffle sharding, it is easy to get the effect of "default" strategy simply by setting shard size of the tenant to 0.

This affects:

• distributor
• ruler
• compactor
• store-gateway

Benefit of this change is small reduction of CLI parameters, code and documentation.

[pracucci]

I propose to drop support for "default" strategy in the configuration and code. When using shuffle sharding, it is easy to get the effect of "default" strategy simply by setting shard size of the tenant to 0.

I agree. I would also make sure default shard size is 0.

[09jvilla]

Renaming to remove 'proposal' since we're going to move forward with this based on the thumbs up / feedback from others on this issue.

[pstibrany]

This is finished, changes were done in #888, #889, #891 and #903.