Warn if fencing will fail

Verify our IPMI state on startup, and then warn if fencing will fail.
For now, this is sufficient, but in future (requires refactoring) we
might want to adjust how fencing occurs based on this information.

node-daemon/pvcnoded/fencing.py

@@ -144,3 +144,16 @@ def rebootViaIPMI(ipmi_hostname, ipmi_user, ipmi_password, logger):
         logger.out('Failed to reboot dead node', state='e')
         print(ipmi_reset_stderr)
         return False
+
+#
+# Verify that IPMI connectivity to this host exists (used during node init)
+#
+def verifyIPMI(ipmi_hostname, ipmi_user, ipmi_password):
+    ipmi_command_status = '/usr/bin/ipmitool -I lanplus -H {} -U {} -P {} chassis power status'.format(
+        ipmi_hostname, ipmi_user, ipmi_password
+    )
+    ipmi_status_retcode, ipmi_status_stdout, ipmi_status_stderr = common.run_os_command(ipmi_command_status, timeout=2)
+    if ipmi_status_retcode == 0 and ipmi_status_stdout != "Chassis Power is on":
+        return True
+    else:
+        return False