etest: Print the test name even if the test crashes

[robinlinden]

std::cout is buffered, so if the test body hits e.g. an assert, it's likely that the crashing test's name won't show up in the output.

Before:

good test : PASSED
Assertion failed: false, file etest/meme_test.cpp, line 5

After:

good test : PASSED
bad test  : Assertion failed: false, file etest/meme_test.cpp, line 5