The device count process can be quite slow on a system with
lots of interfaces. Doing this during report_state can block
it long enough that the agent will be reported as dead and
bindings will fail.
This adjusts the logic to only update the configuration during
the normal device retrieval for the scan loop. This will leave
the report_state loop unblocked by the operation so the agent
doesn't get reported as dead (which blocks port binding).
Closes-Bug: #1648206
Change-Id: Iff45fb6617974b1eceeed238a8d9e958f874f12b
(cherry picked from commit 1a2a71baf3)
151af89ddc