caffe2/caffe2/operators/text_file_reader_utils_test.cc: avoid shadowing warnings
caffe2/caffe2/operators/text_file_reader_utils_test.cc: avoid shadowing warnings

Summary:
Fix warnings exposed by gcc-4.9.x's -Wshadow-compatible-local
I plan to enable this for all of fbcode, soon.
See t13698406 for justification.

Rename inner "i" to "j", twice.

This avoids the following errors:

  caffe2/caffe2/operators/text_file_reader_utils_test.cc:56:14: error: declaration of 'i' shadows a previous local [-Werror=shadow-compatible-local]
  caffe2/caffe2/operators/text_file_reader_utils_test.cc:47:14: error: declaration of 'i' shadows a previous local [-Werror=shadow-compatible-local]
  caffe2/caffe2/operators/text_file_reader_utils_test.cc:41:12: error: shadowed declaration is here [-Werror=shadow-compatible-local]

Reviewed By: Yangqing

Differential Revision: D4544810

fbshipit-source-id: 089d73466f48a7a28b2a516117a12389c3ad54d2

Yangqing/caffe2,sf-wind/caffe2,sf-wind/caffe2,davinwang/caffe2,Yangqing/caffe2,bwasti/caffe2,pietern/caffe2,bwasti/caffe2,xzturn/caffe2,Yangqing/caffe2,xzturn/caffe2,sf-wind/caffe2,pietern/caffe2,davinwang/caffe2,davinwang/caffe2,xzturn/caffe2,pietern/caffe2,xzturn/caffe2,davinwang/caffe2,pietern/caffe2,xzturn/caffe2,Yangqing/caffe2,sf-wind/caffe2,bwasti/caffe2,caffe2/caffe2,Yangqing/caffe2,pietern/caffe2,sf-wind/caffe2,davinwang/caffe2,bwasti/caffe2,bwasti/caffe2