🐞 Don't run etcd tests without etcd

Now we check first to see if etcd is running before diving in & testing
against it.

fixes:
```
Unexpected error:
    <*fmt.wrapError | 0xc0003bc8e0>: {
        msg: "couldn't GET \"my-key\": context deadline exceeded",
        err: <context.deadlineExceededError>{},
    }
```

bin/make_all

@@ -4,7 +4,7 @@
 #
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 cd $DIR/../src/sslip.io-dns-server
-ldflags="-X xip/xip.VersionSemantic=2.3.0 \
+ldflags="-X xip/xip.VersionSemantic=2.4.0 \
          -X xip/xip.VersionDate=$(date +%Y/%m/%d-%H:%M:%S%z) \
          -X xip/xip.VersionGitHash=$(git rev-parse --short HEAD)"
 export GOOS GOARCH