Remove the code trying to set some default helptext in BooleanFlag and EnumFlag, they will never be executed because the super class guarantees it won't be empty.
Remove the code trying to set some default helptext in BooleanFlag and EnumFlag, they will never be executed because the super class guarantees it won't be empty.

	Change on 2016/09/08 by yileiyang <yileiyang@google.com>

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=132572699

google/python-gflags