Conflicts:
	software/kvm/software.cfg

Use new recipes in KVM to make instance not raise when no frontend is found,
Don't request slave kvm frontend instance on SAME machine,
Check if frontend is available using a promise

Use new recipes in KVM to make instance not raise when no frontend is found,
Don't request slave kvm frontend instance on SAME machine,
Check if frontend is available using a promise

This reverts commit 35c5c950.

It allows to build libcairo.

Decouple the seleniumrunner from the browser and the xserver.

Provides the xserver and the firefox hook.

seleniumrunner code (inside the recipe) still has to be merged with its
original code to prevent duplication.