If you are running lava-tool on Debian unstable (sid) or testing (stretch), the new version of python-keyring (8.4.1-1) will break lava-tool at versions lower than 0.14-2 as it has moved a previously supported component into a separate package which did not previously exist. Sadly, the lava-tool maintainers were not made aware of this change in functionality in advance - lava-tool simply stopped working in unstable.
lava-tool 0.14-2 has been uploaded with the only change being a dependency on python-keyrings.alt which is the new package which provides the functionality formerly available as part of python-keyring itself. python-keyrings.alt already exists in Debian testing and can be safely installed ahead of the upgrade of python-keyring, so users may wish to install python-keyrings.alt now in order to maintain functionality.
Version 8.4 of python-keyring will migrate into Debian testing before version 0.14-2 of lava-tool can migrate, so users of testing may have a short window where lava-tool fails in Debian testing if python-keyrings.alt is not installed in advance.
Ubuntu users may also be affected as python-keyring is a "main" package, so may possibly update in Xenial Xerus - however as lava-tool is a "universe" package, it may not be possible to upgrade Xenial to 0.14-2 of lava-tool. Users are advised to manually install python-keyrings.alt to maintain functionality.
lava-tool users running Jessie are not affected (but are advised to upgrade to 0.14-1~bpo8+1 from jessie-backports for other updates, new functionality and bug fixes).