Removes all use of the _LE, _LI, and _LW translation markers

Registered by zhangyanxian

Since log messages will be no longer translated by I18n in the future,we should remove log translations all to simplify logging and to avoid confusion with new contributions.
See:
http://lists.openstack.org/pipermail/openstack-i18n/2016-November/002574.html
http://lists.openstack.org/pipermail/openstack-dev/2017-March/113365.html

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zhangyanxian
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zhangyanxian
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