Copy a proto file to the temporary directory, with appropriate
        line replacements

def _copySchemaFile(self, src, dst):
        """
        Copy a proto file to the temporary directory, with appropriate
        line replacements
        """
        with open(src) as srcFile, open(dst, 'w') as dstFile:
            srcLines = srcFile.readlines()
            for srcLine in srcLines:
                toWrite = self._doLineReplacements(srcLine)
                dstFile.write(toWrite)