Set the reservationId when a new NetworkRequest is created

This populates the reservationId with the value of the requestId when a
new NetworkRequest is created. Conceptually, the reservationId is not
related to the requestId; however, the requestId fulfills the same
uniqueness requirements that are needed for the reservationId, so it can
just be reused for this purpose.

Test: atest NetworkRequestTest
Change-Id: Icecb889a5269554add5791587f1ce7319271fd9e
3 files changed