ChangBo Guo(gcb) 4d35db56f8 Add method last_bytes in fileutils
Method last_bytes is used in some projects[1]. It's good to bring
this method in fileutils according to discussion in dev ML[2].

[1] http://codesearch.openstack.org/?q=last_bytes&i=nope&files=&repos=
[2] http://lists.openstack.org/pipermail/openstack-dev/2017-July/120259.html

Change-Id: I1cd61de58b759916ecd0569afb2485de0b31c405
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