FileEntry does not overide getMetadataKeys

Hi,

I have found that FileEntry does not override getMetadataKeys
inherited from BaseEntry. I think it is a bug. If you try to 
iterate over entry keys without accessing some entry item
first, you will get only small portion of keys available for
the entry.

The following method implementation fixes the issue for me.

    def getMetadataKeys(self):
       if self._populated_data == 0:
            self.__populatedata()

        return base.EntryBase.getMetadataKeys(self)

Thanks,
Andrey 

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