Add tests for scripts in output_template

[tfujiwar]

Because there are no tests for the scripts in output_template, they sometimes get broken but we cannot notice that (e.g. https://github.com/blue-oil/blueoil/issues/852).

Adding an inference step at the end of the E2E test is one solution. https://github.com/blue-oil/blueoil/blob/2d134b72bea9dd3ba418f6bc460c0b8c42c14664/tests/e2e/conftest.py#L60-L67

[hadusam]

I added inference tests as follows. #872

• [x] ubuntu(x86)
• [x] ubuntu(x86_avx)
• [x] raspbery-pi(aarch64)
• [x] de10-nano(arm)

We also need a test of

• [ ] de10-nano(fpga)

I also tried to add de10-nano(fpga), but the inference was hanged up. I think it is caused by our test configs, so I will investigate it.