Fix formatting bug in logging call.

The logging functions already take a format string, so this was
breaking when the input contained a `%`.
Merge remote branch 'moc/devel' into logging-fix
Make node_power_cycle more robust.

We want to make sure the machines always pxe, so let's set that
explicitly via ipmi before rebooting - the blades we have in our dev
environment seem to have some issues around settings this permanently in
the BIOS.

Additionally, power_cycle will now still power on a node if it was
previously off.
Add importlib to requirements. Meets unmet dependency
Merge pull request #244 from zenhack/logging-fix

Logging fix
Merge pull request #245 from zenhack/ipmi-bootdev

Make node_power_cycle more robust.
Merge pull request #243 from henn/add-importlib

Add importlib to requirements. Meets unmet dependency