Update readme  doc howto troubleshoot (#1052)
Update readme  doc howto troubleshoot (#1052)

Note common troubleshooting tools/steps in README
electrofelix/vagrant-libvirt,pradels/vagrant-libvirt,vagrant-libvirt/vagrant-libvirt,vagrant-libvirt/vagrant-libvirt,electrofelix/vagrant-libvirt,vagrant-libvirt/vagrant-libvirt,electrofelix/vagrant-libvirt,pradels/vagrant-libvirt