The OEM IPMI interface for status

This lets one get/set various aspects of the control daemon,
including whether it's fallen into fail-safe mode, or whether a
zone is in manual mode.  Manual mode in this implementation is
zone specific and not fan specific.

Change-Id: I1611fefad198b64c28a780073674896d6efbf877
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/ipmi/README b/ipmi/README
new file mode 100644
index 0000000..8bf37cf
--- /dev/null
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+This holds the source for the library we install to handle the manual control
+OEM IPMI command.
+
+The command is a simple series of bytes:
+[0] = Subcommand, Get(0) or Set(1), Get(2) for fail-safe mode.
+[1] = ZoneId
+[2] = Value if Set
+
+If Value == 1, then ManualMode is True and enabled, otherwise it's in normal
+mode.
+
+If Value == 1 (and Subcommand == 2), Failsafe mode is enabled, otherwise it's
+not.