pytest-cloud uses unsupported arcfour cipher

[dasm]

With the release of OpenSSL 7.6, there was dropped support of arcfour https://www.openssh.com/txt/release-7.6

arcfour cipher is being used when negotiating connection with rsync https://github.com/pytest-dev/pytest-cloud/blob/master/pytest_cloud/rsync.py#L89

When unwrapped from parallel and executed from command line:

$ rsync -arHAXx --bwlimit=10000 --ignore-errors --numeric-ids --force --inplace --delete-excluded --delete -e "ssh -T -c arcfour -o Compression=no -x" . hostname:pytest_directory
Unable to negotiate with hostname port 22: no matching cipher found. Their offer: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,cast128-cbc,3des-cbc
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(226) [sender=3.1.2]
$ echo $?
255
$ rsync -arHAXx --bwlimit=10000 --ignore-errors --numeric-ids --force --inplace --delete-excluded --delete -e "ssh -T -o Compression=no -x" . hostname:pytest_directory
$ echo $?
0

Both servers use the same version of OpenSSL

[source]$ ssh -Q key
ssh-ed25519
[email protected]
ssh-rsa
ssh-dss
ecdsa-sha2-nistp256
ecdsa-sha2-nistp384
ecdsa-sha2-nistp521
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[dsmigiel@sj-avl-r1-1 dcp-test-utils]$ ssh -V
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips  26 Jan 2017

---

[destination]$ ssh -Q key
ssh-ed25519
[email protected]
ssh-rsa
ssh-dss
ecdsa-sha2-nistp256
ecdsa-sha2-nistp384
ecdsa-sha2-nistp521
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[destination]$ ssh -V
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips  26 Jan 2017

[dasm]

Fix has been merged. Will be released with new version of pytest-cloud