Previously, the OEM names dictionary was compiled in and
updating it required rebuilding of `ipmitool`, thus taking a
long time for newly registered OEMs to get supported by the tool.
Building also required a direct internet connection to succeed.
With this commit, the OEM enterprise dictionary is now loaded from
either ${HOME}/.local/usr/share/misc/enterprise-numbers or from
/usr/share/misc/enterprise-numbers (in that precedence).
Those files can be downloaded from iana.org at
http://www.iana.org/assignments/enterprise-numbers
Partially resolvesipmitool/ipmitool#11
Fixes: 9d41136c9b7c7d392f1a3f3adeb6d7fe3bd3135e
Signed-off-by: Alexander Amelkin <alexander@amelkin.msk.ru>