change reframe log format

[jgphpc]

This is a minor feature request: when running reframe, the test's name appears like this:

• [----------] start processing checks
• [ RUN ] run_cuda_strong %use_tool=nsys %gpus_per_cn=4 /64414b57 @hpc:gpu+builtin

Would it be possible to replace /64414b57 with *64414b57 ? Just makes it easier when copy/paste...

and it would be nice to have it in the perf. report:

• PERFORMANCE REPORT
• run_cuda_strong %use_tool=nsys *64414b57

[vkarak]

I am in favor or the /<hash> because it's also used by Spack and we use also the same convention when we select the tests with the -n option, so that -n /<hash> selects a specific test.