Fix the DHCP validations

Some of the environments don't have virtualenv installed by default
which makes the `pip` module fail.

In addition, the latest release of scapy seems broken on RHEL (from
scapy.all import BOOTP raises an exception) so we explicitly specify an
older release that works.

Partial-Bug: #1634023
Change-Id: I5bfd1d38a647c6846d4889c0ec7a8a2d659f7647

validations/dhcp-introspection.yaml

@@ -13,8 +13,10 @@
       groups:
         - pre-introspection
   tasks:
+  - name: Install python-virtualenv
+    package: name=python-virtualenv state=present
   - name: Install scapy
-    pip: name=scapy state=present virtualenv=/tmp/validations-venv
+    pip: name=scapy version=2.3.2 state=present virtualenv=/tmp/validations-venv
   - name: Look up the introspection interface
     ini: path=/etc/ironic-inspector/inspector.conf section=firewall key=dnsmasq_interface
     register: interface

validations/dhcp-provisioning.yaml

@@ -18,7 +18,9 @@
     hiera: name="tripleo_undercloud_conf_file"
   - name: Gather undercloud.conf values
     undercloud_conf: undercloud_conf_path={{ tripleo_undercloud_conf_file }}
+  - name: Install python-virtualenv
+    package: name=python-virtualenv state=present
   - name: Install scapy
-    pip: name=scapy state=present virtualenv=/tmp/validations-venv
+    pip: name=scapy version=2.3.2 state=present virtualenv=/tmp/validations-venv
   - name: Look for DHCP responses
     script: files/rogue_dhcp.py {{ undercloud_conf.DEFAULT.local_interface|default('eth1') }}