System Information
Operating system: Windows 10
Graphics card: GeForce GTX 1060 6GB

Blender Version
Broken:
Blender 2.82 (sub 7) (hash 375c7dc4caf4 built 2020-03-12 15:41:08)

Short description of error
When importing .obj with materials (.mtl file) base color node is assigned to relfection texture map ('refl' option in mtl) instead of diffuse texture map('map_Kd' option in mtl).

Exact steps for others to reproduce the error
Import any obj file with .mtl with material such as:

newmtl Black
Ns 225.000000
Ka 1.000000 1.000000 1.000000
Kd 0.800000 0.207131 0.039412
Ks 0.500000 0.500000 0.500000
Ke 0.0 0.0 0.0
Ni 1.450000
d 1.000000
illum 2
map_Kd base_color.jpg
refl metallic.jpg

In result base color of Black material will be matallic.jpg texture instead of base_color.jpg.

Problem seems to be in line 221 of rBA/io_scene_obj/import_obj.py, where refl map is saved as base_color_texture instead of metallic_texture as is specified in obj exporter rBA/io_scene_obj/export_obj.py in line 119

I attached a zip file with sample obj that doesn't import properly