Fix validation for ConsistencyLevel.LocalOne

The code currently checks that the consistency for a query is not >= ConsistencyLevel.Serial (0x0008) when validating the Consistency level for a query which would mean it would reject ConsistencyLevel.LocalOne (which is 0x0010), even though that is a valid value.  I'm pretty sure that this bug has been around for awhile (probably affects 1.X driver as well), it just moved to a different place in this commit:  https://github.com/datastax/csharp-driver/commit/90ae73331ccdc9319b0c8900e5e9d489b9faf67e.