Add chassis power on/off to obmcutil

The recent refactoring of the systemd target names to power on
and off the chassis had a significant impact to openpower partners
because they'd encoded the systemctl command to power on just
the chassis into a lot of instructions and scripts. There's no
guarantee the team won't do this again in the future so a wrapper
around the command for this function makes sense to have.  Now if
the target name changes, it's all abstracted within obmcutil.

Change-Id: Ib7b1907cf4618cf0985f76f2c5f5c5e04d4c162f
Signed-off-by: Andrew Geissler <andrewg@us.ibm.com>
1 file changed