Add n1ql.scope and n1ql.collection spel expressions for @Query.

[mikereiche]

This adds n1ql.scope and n1ql.collection spel expressions for
@query so that n1ql.bucket doesn't need to be overloaded with
the collection name. This will make the bucket name available
in n1q.bucket.

This is a breaking change as queries that used n1ql.bucket to
get the collection name (especially in the case of pre-scope-
and-collection @queries that (a) referenced n1ql.bucket instead
of referencing other spel expressions that include the
bucket/collection name; and (b) still worked after the
repository was moved from a bucket onto a collection by
virtue of n1ql.bucket having the value of the collection in
such instances.

Closes #1445.

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