[Nfd-dev] NFD RIB Daemon - trigger FIB updates from RIB

[Junxiao Shi]

Hi Jeff

It's possible to achieve 10ms prefix registration if RibManager responds to
the request before FIB updates are complete.
However, Interests will not be delivered to the application until FIB
updates are complete.

This may cause problem in the following scenario:

1. The email client registers a prefix for the email to be sent.
2. After the prefix registration is complete (RIB update request is
answered), the email client sends a command to the server, which requests
the server to retrieve the email.
3. The email server expresses an Interest toward the client.

If the FIB updates are not completed before step 3, the email server will
be unable to retrieve the email.
Therefore, we think RIB Daemon should not answer a prefix registration
request from application before all FIB updates are complete.

Yours, Junxiao
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