[qa] Switch to py3

[maflcko]

Blockers:

• bitcoin-util-test.py fails with python3.2 #7893 (figure out fix for bctest.py on precise) OR Switch Travis to Trusty #7920 (bump to trusty)

[laanwj]

Ah yes - merging a pull that adds a new test wasn't a very good idea. Now this probably needs to be updated to include the new test, otherwise it can't be merged without breaking travis.

[maflcko]

JSONRPC error: Method not found

Na, you just need to compile the new signmessage code.

Rebased nonetheless.

[maflcko]

Interesting that this makes the test slower, though:

py3:

$ ./qa/pull-tester/rpc-tests.py signmessages
Running testscript signmessages.py ...
Initializing test directory /tmp/testgxs02bu5
Stopping nodes
Cleaning up
Tests successful
Duration: 2 s

py2:

$ ./qa/pull-tester/rpc-tests.py signmessages
Running testscript signmessages.py ...
Initializing test directory /tmp/testXaAvpQ
Stopping nodes
Cleaning up
Tests successful
Duration: 0 s

wait_bitcoinds() takes 2 seconds now.

[laanwj]

Strange.

[maflcko]

Indeed interesting; Other test still run fast with py3:

$ qa/pull-tester/rpc-tests.py disablewallet
Running testscript disablewallet.py ...
Initializing test directory /tmp/test_zgnh7e3
Stopping nodes
Cleaning up
Tests successful
Duration: 0 s

But let's not worry about it too much, this will be compensated by #7972, hopefully.

[laanwj]

Right, well if it is two seconds on one test I don't see why it would need to be a blocker.