Support Boolean types for redfish uefi attribs

BIOS settings set as boolean are now handled with some
sanity.

Change-Id: I77eb3dd3259746ae4739a2f4c255bdc8d62db9d4

pyghmi/redfish/command.py

@@ -95,6 +95,20 @@ def _mask_to_cidr(mask):
     return cidr
 
 
+def _to_boolean(attrval):
+    attrval = attrval.lower()
+    if not attrval:
+        return False
+    if ('true'.startswith(attrval) or 'yes'.startswith(attrval) or
+            'enabled'.startswith(attrval) or attrval == '1'):
+        return True
+    if ('false'.startswith(attrval) or 'no'.startswith(attrval) or
+            'disabled'.startswith(attrval) or attrval == '0'):
+        return False
+    raise Exception(
+        'Unrecognized candidate for boolean: {0}'.format(attrval))
+
+
 def _cidr_to_mask(cidr):
     return socket.inet_ntop(
         socket.AF_INET, struct.pack(
@@ -1088,6 +1102,8 @@ class Command(object):
                               regentry.get('DisplayName', '')):
                     if regentry.get('Type', None) == 'Integer':
                         changeset[change] = int(changeset[change])
+                    if regentry.get('Type', None) == 'Boolean':
+                        changeset[change] = _to_boolean(changeset[change])
         redfishsettings = {'Attributes': changeset}
         self._do_web_request(self._setbiosurl, redfishsettings, 'PATCH',
                              etag=etag)