Add support for dns.hosts plugin

[mjtrangoni]

Hi @MonolithProjects,

I've found that the node-local-dns image v1.22.9 include the dns.hosts CoreDNS plugin, so this PR is adding support for it.

Basically, adding this to the values.yaml,

config:
  localDnsIp: 169.254.20.11
  zones:
    .:53:
      plugins:
        [...]
        hosts:
          entries:     # dns.hosts INLINE
            - ip: 10.5.0.4
              name: blabla.lala
          ttl: 3600       # in seconds, 3600 (default)
          no_reverse: true    # set no_reverse
          reload: "0s"    # 0s disable (default), use duration notation, ie, "1.5h"
          fallthrough: true
        [...]

would produces a Corefile like this,

  Corefile: |-
    .:53 {
      [...]
      hosts {
        10.5.0.4 blabla.lala
        ttl 3600
        no_reverse
        reload "0s"
        fallthrough
      }
    [...]
    }

I've left the example commented out just for reference.

Thank you!

[MonolithProjects]

LGTM. Thanks