fix t.log in hooks

[dflupu]

Fixes #1536

I've looked into grouping per-test hook output with the test output, and while the changes necessary were rather trivial, there were a few downsides such as:

• it would be inconsistent with the per-file hooks that would still not be grouped
• it's rather confusing and unnecessary in practice
• test results would not be printed until all of the after hooks finish

[novemberborn]

I've looked into grouping per-test hook output with the test output, and while the changes necessary were rather trivial, there were a few downsides such as:

• it would be inconsistent with the per-file hooks that would still not be grouped
• it's rather confusing and unnecessary in practice
• test results would not be printed until all of the after hooks finish

Fair enough. I'd really like to revisit the reporters, we could improve this later.

[novemberborn]

Just retrying one CI run to see if the failure is intermittent, otherwise this looks great!