LU-56 libcfs: move range expression parser to libcfs

LU-56 libcfs: move range expression parser to libcfs

There are mulptile implementations of range expression parser,
we removed those redundant code and move the only implementation
into libcfs so everyone can use it.

Signed-off-by: Liang Zhen <liang@whamcloud.com>
Change-Id: I0717fbff2f32a616ff94f6bd53b363fda7d77168
Reviewed-on: http://review.whamcloud.com/2346
Tested-by: Hudson
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Doug Oucharek <doug@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>