Support dangerousSkipTLSVerify option when fetching from http server.

[GrahamDumpleton]

Describe the problem/challenge you have

I need to use vendir to download files from a web server but the web server uses self signed certificates. This will fail as vendir will verify certificates when using http. Docs do not give an example to say can disable this check so assume you can't.

Describe the solution you'd like

Add dangerousSkipTLSVerify option to http section.

    http:
      # asset URL (required)
      url: 
      # verification checksum (optional)
      sha256: ""
      # specifies name of a secret with basic auth details;
      # secret may include 'username', 'password' keys (optional)
      secretRef:
        # (required)
        name: my-http-auth
      # skip unpacking tar, tgz, and zip files; by default files are unpacked (optional)
      disableUnpack: false

      # specify wether to skip TLS verification; defaults to false
      dangerousSkipTLSVerify: false

Anything else you would like to add:

Should also be added to kapp-controller to keep parity.

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[vmunishwar]

@GrahamDumpleton - Thanks for reporting the issue. We have a similar issue earlier reported. I guess these are requesting the same changes. Could you please confirm?

[GrahamDumpleton]

Similar but not the same. The other one is for git fetch, not http fetch. So different parts of code and for different functionality in vendir.