Distinguish between requested and selected oids

Pick the right set of OIDs to use in mechglue functions.
We have 3 oids to care for:
The desired/requested oid, it can be a valid oid or a special interposer oid
used to avoid looping back to an interposer plugin when the interposer wants to
access a local mechanism.
The selected_oid, that is the actual oid of the mechanism we are going to use,
it could be an interposer oid.
The public oid, which normally is the same as the desired/requested oid except
when a special interposer oid is used by an interposer.

FIXME: Set the right mech_type on contexts

- issue with accept_sec_context, how to fallback to local mechanism ?
- may need to use magic fallback error

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