read_fru_data: move and rename constants

Moved the DBus constants, used for reading FRU records
from the Inventory, to the read_fru_data.hpp header file.
Renamed these constants to comply with the
lowerCamelCase convention.
Moved and renamed constants remain within the ipmi::fru namespace.

Change-Id: If32c4a9c176453c414d9813c801ecc11ff81c038
Signed-off-by: Kirill Pakhomov <k.pakhomov@yadro.com>
2 files changed