move all services s/obmc-standby/multi-user/g

Transition all the services away from the custom obmc-standby service to
the default multi-user target.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Icc5cd0eb0767318f27fd8d568818659a50bbd987
diff --git a/power-control/service-files/xyz.openbmc_project.Chassis.Control.Power@.service b/power-control/service-files/xyz.openbmc_project.Chassis.Control.Power@.service
index 3bbfb17..028e8c7 100644
--- a/power-control/service-files/xyz.openbmc_project.Chassis.Control.Power@.service
+++ b/power-control/service-files/xyz.openbmc_project.Chassis.Control.Power@.service
@@ -13,5 +13,5 @@
 BusName=xyz.openbmc_project.Chassis.Control.Power
 
 [Install]
-WantedBy=obmc-standby.target
+WantedBy=multi-user.target