review dzdb catalog entries

[bhuffaker]

https://catalog.caida.org/search?query=dzdb

• update the catalog entries to reflect that they are restricted and the URL should point to the access form ( you will get it from [email protected])

[nicole9925]

https://github.com/CAIDA/catalog-data/blob/dzdb_v0/sources/software/dzdb_api.json

I edited the dzdb api in my branch to say "restricted." I will update the link when I receive the form. I've also added a note to the receipes that use the dzdb that the API is restricted and needs an API key.