host-bmc: refine remote terminus functionality

This commit introduces support for migrating remote terminus-related
functionalities into the host-bmc directory, a move aimed at optimizing
remote terminus operations for future endeavors. By consolidating these
functionalities, tracking and implementing future enhancements become
more streamlined and manageable.

Change-Id: I52b6ced7acacb004b6055ae710193a959d986659
Signed-off-by: Kamalkumar Patel <kamalkumar.patel@ibm.com>