Update softoff to support new host control interface

The new host control design requires applications use its
new dbus interfaces to interact with the host.  This commit
moves the softoff application over to this new interface.

Change-Id: I3c6830a59d72df1f112ee7a63a08bfca53375bf7
Signed-off-by: Andrew Geissler <andrewg@us.ibm.com>
diff --git a/xyz/openbmc_project/Ipmi/Internal/SoftPowerOff.errors.yaml b/xyz/openbmc_project/Ipmi/Internal/SoftPowerOff.errors.yaml
new file mode 100644
index 0000000..fa75396
--- /dev/null
+++ b/xyz/openbmc_project/Ipmi/Internal/SoftPowerOff.errors.yaml
@@ -0,0 +1,3 @@
+- name: SoftOffFailed
+  description: The SoftOff command to the host control object returned an error
+
diff --git a/xyz/openbmc_project/Ipmi/Internal/SoftPowerOff.metadata.yaml b/xyz/openbmc_project/Ipmi/Internal/SoftPowerOff.metadata.yaml
new file mode 100644
index 0000000..3b4359e
--- /dev/null
+++ b/xyz/openbmc_project/Ipmi/Internal/SoftPowerOff.metadata.yaml
@@ -0,0 +1,3 @@
+- name: SoftOffFailed
+  level: ERR
+