Fix exec fail using shell in lieu of command (#82)

The linter told me to use `command` in lieu of shell which breaks
functionality due to additional commands being treated as extra
arguments to the first command. Revert to using shell where needed so
the right thing is done.

ansible/playbooks/infra-deploy.yaml

@@ -584,14 +584,16 @@
       ignore_errors: true
       failed_when: hosts_updated.rc not in [0, 1]
     - name: Add inventory to hosts file iff no 172.31. IPs exist
-      command: cat /etc/genestack/inventory/{{ os_network_name }}-inventory.ini | awk '/ansible/ { print $2, $1 }' | cut -f2 -d"=" >> /etc/hosts
+      shell: cat /etc/genestack/inventory/{{ os_network_name }}-inventory.ini | awk '/ansible/ { print $2, $1 }' | cut -f2 -d"=" >> /etc/hosts
       when: hosts_updated.rc == 1
+      tags:
+        - skip_ansible_lint
     - name: Check if kubectl exists
       command: test -f /usr/local/bin/kubectl
       register: kubectl_exists
       failed_when: kubectl_exists.rc not in [0, 1]
     - name: Download kubectl
-      command: curl -L "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl" -o /usr/local/bin/kubectl
+      shell: curl -L "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl" -o /usr/local/bin/kubectl
       when: kubectl_exists.rc == 1
       tags:
         - skip_ansible_lint