Adding library to run_crefi() to glustolibs-IO.

What is crefi?
Crefi is a Python command-line tool to create multi
threaded workload on a filesystem and do file operations
on created data. It provides basic operations to create files
of different sizes, different types, in different directory
structures, along with creating symlinks, hardlinks to files,
and also rename, truncate, chmod, chown, chgrp and
setxattr on the created files. Typical use involves creating
large number of files of different sizes, over different layout,
and do different operations on the created files.

Which components need this tool?
- Geo-rep
- AFR

Changes needed in infrastructure:
https://github.com/gluster/centosci/commit/1fe330d34a62b56438f6eb86538286962b1abd90

Change-Id: I1e579f6f1f2c6ef0d018c055234abbf0f147e621
Signed-off-by: kshithijiyer <kshithij.ki@gmail.com>

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