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sync: update CI config files

chore: fixup tests and ensure go vet and staticcheck pass

make DNS resolver pluggable

Co-authored-by: Adin Schmahmann <adin.schmahmann@gmail.com>

See discussion in:
https://github.com/ipfs/go-namesys/pull/13#pullrequestreview-641398404

https://github.com/ipfs/go-ipfs/issues/8060

* Properly report DNSLink errors

Only report that there is no DNSLink for a name when there are no DNSLink TXT records available for that name.  For all other errors, such as being offline, report the more general "cannot resolve name" error.

* Document that we give precedence to good results from looking up DNSLinks in TXT records from `"_dnslink."+fqdn` over results from `fqdn`.

Co-authored-by: Marcin Rataj <lidel@lidel.org>

This outputs a missage that blames a specific sife for not having DNSLink record.  For example, the error message looks like:

`could not resolve name: bad.example.net is missing DNSLink record (https://docs.ipfs.io/concepts/dnslink/)`

The "could not resolve name" portion is still present because the returned error wraps the original ErrResolveFailed, allowing code to test if the error is an ErrorResolveFailed error.

Use eth.domains instead of eth.link for .eth names

Remove dependencies to go-unixfs

Remove InitializeKeyspace function from publisher

Chore: bump go.mod and testing to go1.15

chore: remove unused go-ipfs dependency in go.mod

The remaining dependency was in tests. We can hardcode a CID instead of
requiring unixfs just to obtain an arbitrary CID that correspond to the empty
directory.

This is mostly go-ipfs specific and has been moved there.

See https://github.com/ipfs/go-ipfs/pull/7984

This was a bad leftover.