adding all required template values to host vars and accessing them correctly

inventory/host_vars/qa02.qa.fedoraproject.org

@@ -8,6 +8,10 @@ volgroup: vmstore
 clients:
   - hostname: virt01.qa.fedoraproject.org
     macaddress: "52:54:00:a2:de:30"
+    memsize: 4096
+    num_cpus: 2
   - hostname: virt02.qa.fedoraproject.org
     macaddress: "52:54:00:fe:22:ff"
+    memsize: 4096
+    num_cpus: 2
 

roles/beaker/virthost/templates/client-libvirt.xml.j2

@@ -1,7 +1,7 @@
 <domain type='kvm'>
   <name>{{ item.hostname }}</name>
-  <memory unit='KiB'>{{ mem_size_kb }}</memory>
-  <vcpu placement='static'>{{ num_cpus }}</vcpu>
+  <memory unit='MiB'>{{ item.memsize }}</memory>
+  <vcpu placement='static'>{{ item.num_cpus }}</vcpu>
   <os>
     <type arch='x86_64' machine='pc-i440fx-1.6'>hvm</type>
     <bootmenu enable='yes'/>