remove unused enable/disableNetworkIPMI functions

enableNetworkIPMI and disableNetworkIPMI were legacy functions from
before implementing separate netipmid instances for each network
interface.

Change-Id: Ife54412e9dcb86f96309db2cda071de70405b29d
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
1 file changed