Enable 'get_my_shard' API for UDL #76
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Sometimes, a UDL logic needs to know which shard it is running on. Previously, the UDL had to get the view and the node ID to find the shard. Actually, this functionality is available in Derecho
Group(but not inExternalGroupClient) In this pull request, we expose this feature throughServiceClient::get_my_shard(), which will return -1 in case calling from an external client (or this current node does not belong to the subgroup).This feature has been tested from both external clients and UDLs, and regression-tested as well.