When pegleg wraps documents, it uses the original document name as the
name of the managed document. This often results in duplicate documents
(i.e. identical in name and schema). For example, it is expected to have
identically named deckhand document pairs: Certificate & CertificateKey;
CertificateAuthority & CertificateAuthorityKey; PublicKey & PrivateKey.
However, this could also occur for unrelated document types that happen
to have the same name, and generally defeats the principle that each
document is identified by a schema top-level key and the metadata.name.
This change uses a combination of the original document schema and name
to build the name of the pegleg/PeglegManagedDocument/v1.
Change-Id: Iab186ae7e9d24a30cb413be89a17fad960e10bea
417975b596