Updated openstack/openstack
Project: openstack/nova  89546f13db2a725a99b717484e49a9defcf9a5b1
null
xenapi: changes the debug log formatting

This patch changes the log formatting to use multiple arguments instead
of interpolation.

Note:
It's a matter of performance :
When you do the interpolation in your code, this code will be executed
each time you call the logger (event if the logger or the log level is
not activated).
When you let the logger do the interpolation, it will do the interpolation
only if the logger and log level is activated.

Change-Id: I628000767f41bb0ab1839089a0ba98f6974c4635