shardid types are inconsistent across different usages
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Description
We mostly consider shardid of type uint64, however some structs (i.e. ```ShardConnections```) use int64 for that.
It does not cause immediate problem, but we should standardize the way.
@jasonmp85 [suggested](https://github.com/citusdata/citus/pull/1831#discussion_r153863192) that we should use int64
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