CI: Allow overriding memory/cpu from vars.yml

The examples are there to override the memory/count/vpcu of the
lb/master/worker but in reality we were ignoring most of those
values.

This patch adds the missing values to override so we can configure
the deployments on CI vi modifying the vars.yml

ci/infra/testrunner/platforms/terraform.py

@@ -140,7 +140,14 @@ def _update_tfvars(self, tfvars):
             "stack_name": self.stack_name(),
             "username": self.conf.terraform.nodeuser,
             "masters": self.conf.terraform.master.count,
+            "master_memory": self.conf.terraform.master.memory,
+            "master_vcpu": self.conf.terraform.master.cpu,
             "workers": self.conf.terraform.worker.count,
+            "worker_memory": self.conf.terraform.worker.memory,
+            "worker_vcpu": self.conf.terraform.worker.cpu,
+            "lbs": self.conf.terraform.lb.count,
+            "lb_memory": self.conf.terraform.lb.memory,
+            "lb_vcpu": self.conf.terraform.lb.cpu,
             "authorized_keys": [self.utils.authorized_keys()]
         }