improve logging output

[marten-seemann]

Removing all the pyshark output definitely helped, but I'd like a bit more. For instance, take this output:

Saving logs to ./logs.
Expected exactly 1 handshake. Got: 3
Expected at least 2 ClientHellos. Got: 0
Expected exactly 2 handshake. Got: 4
Missing files: ['dleshiaewf']
Expected 50 handshakes. Got: 46
Missing files: ['wjrfeuzvmi']
Expected 50 handshakes. Got: 48
Missing files: ['arwuloafqh']
Missing files: ['nxgwhmfkkg']
Missing files: ['htjehiteld']
Run took 0:11:58.096941
Server: quant. Client: msquic. Running test case: handshake
Server: quant. Client: msquic. Running test case: transfer
Server: quant. Client: msquic. Running test case: longrtt
Server: quant. Client: msquic. Running test case: chacha20
Server: quant. Client: msquic. Running test case: multiplexing
Server: quant. Client: msquic. Running test case: retry
Server: quant. Client: msquic. Running test case: resumption
Server: quant. Client: msquic. Running test case: zerortt
Server: quant. Client: msquic. Running test case: http3
Server: quant. Client: msquic. Running test case: blackhole
Server: quant. Client: msquic. Running test case: handshakeloss
Server: quant. Client: msquic. Running test case: transferloss
Server: quant. Client: msquic. Running test case: handshakecorruption
Server: quant. Client: msquic. Running test case: transfercorruption
Server: quant. Client: msquic. Running test case: goodput
Server: quant. Client: msquic. Running test case: crosstraffic
+--------+------------------+
|        |      quant       |
+--------+------------------+
| msquic |        H         |
|        |      Z3C20       |
|        | LRRDCSMC1L1BC2L2 |

IMO, things would be a lot better if the output was modified so that it prints which test is being run, then any errors, and then the final result. Something more like:

Saving logs to ./logs.

Server: quant. Client: msquic. Running test case: handshake
Success

Server: quant. Client: msquic. Running test case: transfer
Expected exactly 1 handshake. Got: 3
Failure

Server: quant. Client: msquic. Running test case: longrtt
Expected at least 2 ClientHellos. Got: 0
Failure
...

fyi, @marten-seemann I don't seem to have the permissions to reactivate the issue.

Originally posted by @nibanks in #158 (comment)