[Spectrum Virtualize Family] During attach or detach operation
there is multiple lshost calls from "get_host_from_connector",
which is causing some delay during attach or detach operations.
This patch fixes the issue by caching the host information during
initialization and searching for host from the cached information.
Closes-Bug: #1913363
Change-Id: I73e58f8b0f4908e9fb097f7ce151a9178cf6b96f
