1. my_addr is not set if an interface does not expose set_my_addr.
Currently, the only interface which requires some special handling to set
my_addr is OpenIPMI. But changing of my_addr still needed for other interfaces.
So, we must set it regardless of presence of set_my_addr().
2. Since set_my_addr() for serial interfaces only sets my_addr, we remove them
as redundand.
3. Bridging is enabled when either trasit_addr or target_addr is not 0.
Currentle transit_addr is not regarded.
4. target_lun does not relate to briging. It is needed for "raw" command. We
set it regardles of bridging.
Commit for: Dmitry Bazhenov
c87aa0b96a