WIP: bring back in-memory dmsgpty whitelist function

[alexadhy]

Part of #84

Changes:

• Brings back the in-memory dmsgpty whitelist function

How to test this PR:

• checkout this PR
• in your local skywire repo directory, do go mod edit -replace github.com/skycoin/dmsg=../dmsg
• test it in the integration test environment

[jdknives]

Its a start. Skywire still does not build because of

GO111MODULE=on go install "-ldflags=-X github.com/skycoin/dmsg/buildinfo.version=v0.1.1-327-gae14da58 -X github.com/skycoin/dmsg/buildinfo.date=2021-06-02T18:10:38Z -X github.com/skycoin/dmsg/buildinfo.commit=ae14da58cac0051d95693f0454b4e341d97fe962" -mod=vendor  ./cmd/skywire-visor ./cmd/skywire-cli ./cmd/setup-node
# github.com/skycoin/skywire/pkg/visor
pkg/visor/init_unix.go:42:16: undefined: dmsgpty.NewJSONFileWhiteList
make: *** [Makefile:71: install] Fehler 2

[alexadhy]

@jdknives We have two options, do I need to rename this

dmsg/dmsgpty/whitelist.go

Line 34 in ac70250

func NewConfigWhitelist(confPath string) (Whitelist, error) {

function to NewJSONFileWhiteList or to rename the one in the skywire repo proper

[jdknives]

You can rename it in skywire repo @alexadhy

[ersonp]

Looks Good. Build is working in integration test environment and also the full terminal in hypervisor.