Timeout cleanup playbook tasks

This adds timeouts to cleanup playbook tasks so that if they have
problems running the entire job does not stall. We noticed that df in
particular can hang on broken nfs mounts and if that happens the job's
cleanup playbook does not end (even after a couple days).

This change adds the timeouts to the testing playbook. If testing shows
this works well we will add it to the production playbooks too.

Change-Id: Ibc875bf99e6da29e2fffbddae8590ecde06b5c3b

playbooks/base-test/cleanup.yaml

@@ -4,13 +4,13 @@
       when: not (zuul_success | bool)
       block:
         - name: get df disk usage
-          raw: df
+          raw: timeout -k 5 90 df
 
         - name: get df inode usage
-          raw: df -i
+          raw: timeout -k 5 90 df -i
 
         - name: get l2 networking
-          raw: ip link
+          raw: timeout -k 5 90 ip link
 
         - name: get l3 networking
-          raw: ip addr
+          raw: timeout -k 5 90 ip addr