Make the Syncgroup factory methods like the ones for Collection

There is currently a Database.Syncgroup(wire.Id) factory method,
change it to be consistent with Collection.SyncgroupForId/Syncgroup,
where Syncgroup() takes a name and context and the user blessing
is pulled from the context.

MultiPart: 3/3
Change-Id: Ie63e86c57721f77c3e011aec6a531d0928ec180f
2 files changed
tree: 48a45d92cc53f6bbe0204ef6436ef85eccd84a37
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