Implement state feedback on firmware update

Provide a means to indicate through string return to show user
what the next step should be.

Change-Id: Id6b9c2bb6e6a46d6eb653622294ae93e858b8356

pyghmi/ipmi/command.py

@@ -1779,7 +1779,7 @@ class Command(object):
         self.oem_init()
         if progress is None:
             progress = lambda x: True
-        self._oem.update_firmware(file, data, progress)
+        return self._oem.update_firmware(file, data, progress)
 
     def attach_remote_media(self, url, username=None, password=None):
         """Attach remote media by url

pyghmi/ipmi/oem/lenovo/handler.py

@@ -840,8 +840,8 @@ class OEMHandler(generic.OEMHandler):
         if self.is_fpc:
             return self.smmhandler.update_firmware(
                 filename, data=data, progress=progress)
-        super(OEMHandler, self).update_firmware(filename, data=data,
-                                                progress=progress)
+        return super(OEMHandler, self).update_firmware(filename, data=data,
+                                                       progress=progress)
 
     def detach_remote_media(self):
         if self.has_imm:

pyghmi/ipmi/oem/lenovo/imm.py

@@ -630,3 +630,4 @@ class XCCClient(IMMClient):
                 raise Exception(
                     'Unknown condition waiting for '
                     'firmware update: ' + repr(rsp))
+        return 'pending'

pyghmi/ipmi/oem/lenovo/nextscale.py

@@ -314,6 +314,7 @@ class SMMClient(object):
             progress({'phase': 'apply',
                       'progress': percent})
             complete = percent >= 100.0
+        return 'complete'
 
     def logout(self):
         self.wc.request('POST', '/data/logout', None)