Add teardown support

This MR adds the ability to teardown a previously bootstrapped set of nodes and attached disks.

Attempting to teardown but not answering YES

$ ansible-playbook teardown.yml -e "prefix_name=ash-lfs-test"

This will remove hosts and disks, are you sure? Answer with 'YES' [NO]: no
 _____________________________
< PLAY [Remove Geo instances] >
 -----------------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

 ___________________________
< TASK [Check Confirmation] >
 ---------------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

fatal: [localhost]: FAILED! => {"changed": false, "msg": "Playbook run confirmation failed"}
 ____________
< PLAY RECAP >
 ------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

localhost                  : ok=0    changed=0    unreachable=0    failed=1    skipped=0    rescued=0    ignored=0

Attempting to teardown and answering YES

$ ansible-playbook teardown.yml -e "prefix_name=ash-lfs-test"

This will remove hosts and disks, are you sure? Answer with 'YES' [NO]: YES
 _____________________________
< PLAY [Remove Geo instances] >
 -----------------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

 ___________________________
< TASK [Check Confirmation] >
 ---------------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

skipping: [localhost]
 ______________
< TASK [debug] >
 --------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

ok: [localhost] => {
    "msg": "[WARNING] Removing can take some time, so please be patient 🙏"
}
 ____________________________________
< TASK [Remove Geo primary instance] >
 ------------------------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

ok: [localhost]
 _________________________________
< TASK [Remove primary DNS entry] >
 ---------------------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

ok: [localhost]
 ______________________________________
< TASK [Remove Geo secondary instance] >
 --------------------------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

ok: [localhost]
 ___________________________________
< TASK [Remove secondary DNS entry] >
 -----------------------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

ok: [localhost]
 ____________
< PLAY RECAP >
 ------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

localhost                  : ok=5    changed=0    unreachable=0    failed=0    skipped=1    rescued=0    ignored=0

Closes: #8 (closed)