React to `dhcp4-change` and `dhcp6-change` NetworkManager dispatcher events#66

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ppetr wants to merge 4 commits intoleamas:develfrom

Commits on May 14, 2022

Include hostnames into cache filenames
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Commits on May 15, 2022

Honor the `NETRC` environment variable
ppetr
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Commits on May 17, 2022

React to `dhcp4-change` and `dhcp6-change` NetworkManager dispatcher events
ppetr
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Merge branch 'devel' of https://github.com/leamas/ddupdate into devel
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