commit 8a3230110f3e697f986f5ef38cf01cf445b7d886
author Patrick Rohr <prohr@google.com> Thu Sep 28 12:06:24 2023 -0700
committer Patrick Rohr <prohr@google.com> Fri Sep 29 17:20:57 2023 +0000
tree cfd11a29f9a4862da2a6fc32865b595248bf778a
parent e6d74e877030e807989349d8864c84d8c8754584

Rename PacketRetransmittingState to MessageExchangeState

rfc8415 refers to packet retransmissions as message exchange. So
renaming PacketRetransmittingState to MessageExchangeState gets us a bit
closer to the language used in the rfc.

I realize that PacketRetransmittingState was adopted from our DHCPv4
implementation; however, considering the complexity of DHCPv6, it is
unlikely that we will ever be able to merge parts of the two
implementations (as had previously been the plan). Doing so would only
needlessly complicate the code and increase the potential (negative)
impact of any change.

Bug: 260934173
Test: mm
Change-Id: Iaf39e9e899753c38a2ed3be2a0bb4a7ecdece4bb