software/kvm: python-with-eggs needs slapos.toolbox

kvm_controller_raw uses slapos.qemuqmpclient from slapos.toolbox

See the following error without this patch:

slapuser61@COMP-202:~/srv/runner/instance/slappart0$ /srv/slapgrid/slappart61/srv/runner/instance/slappart0/bin/kvm_controller_raw
Traceback (most recent call last):
  File "/srv/slapgrid/slappart61/srv/runner/software/1adf3dca589722a5eeac686fd4870ad0/bin/python-with-eggs", line 76, in <module>
    exec(compile(__file__f.read(), __file__, "exec"))
  File "/srv/slapgrid/slappart61/srv/runner/instance/slappart0/bin/kvm_controller_raw", line 9, in <module>
    from slapos.qemuqmpclient import QemuQMPWrapper, getInitialQemuResourceDict
ImportError: No module named qemuqmpclient