bifrost-create-vm-nodes: Add missing libxml and libxslt dependencies

lxml requires the development packages for libxslt and libxml otherwise
it fails with the following error

libxslt/xsltconfig.h: No such file or directory

Change-Id: I4a97dfe88faf1470e67cbceef9cca5c12613391e

playbooks/roles/bifrost-create-vm-nodes/defaults/required_defaults_Debian.yml

@@ -3,6 +3,8 @@ sgabios_dir: /usr/share/qemu/
 libvirt_service_name: libvirt-bin
 required_packages:
  - libvirt-bin
+ - libxslt1-dev
+ - libxml2-dev
  - qemu-utils
  - qemu-kvm
  - qemu-system-x86

playbooks/roles/bifrost-create-vm-nodes/defaults/required_defaults_RedHat.yml

@@ -13,3 +13,5 @@ required_packages:
  - libvirt-daemon
  - pkgconfig
  - libvirt-devel
+ - libxslt-devel
+ - libxml2-devel

playbooks/roles/bifrost-create-vm-nodes/defaults/required_defaults_Suse.yml

@@ -9,5 +9,7 @@ required_packages:
  - libvirt
  - libvirt-client
  - libvirt-daemon
+ - libxslt-devel
+ - libxml2-devel
  - pkg-config
  - libvirt-devel