Remove host_vars/.gitignore

I'll just use ansible-vault and encrypt it instead.  If I had more
host_vars this would suck, as you can't grep the vars there...

Signed-off-by: Alan Orth <alan.orth@gmail.com>
Add host_vars/web01

Signed-off-by: Alan Orth <alan.orth@gmail.com>
roles/munin: Fix nginx template

Accidental syntax error came in when I removed the dns domain

Signed-off-by: Alan Orth <alan.orth@gmail.com>