rename test_innerproduct_layer to test_inner_product_layer

diff --git a/src/caffe/test/test_innerproduct_layer.cpp b/src/caffe/test/test_inner_product_layer.cpp
similarity index 100%
rename from src/caffe/test/test_innerproduct_layer.cpp
rename to src/caffe/test/test_inner_product_layer.cpp