HEXONET: Implement get-zones, fix module problem (#898)

* VULTR: Update govultr to v1.0.0 (fixes #892) (#897)

* go get -u github.com/hexonet/go-sdk

* Fix HEXONET providers.json entry

* providers.json: json commma

* providers.json: fmtjson

* HEXONET: Implement get-zones. Fix tests and docs.

* fixup!

* Update azure test failures

* Move version info into its own package

* Use new version system

main.go

@@ -5,10 +5,9 @@ import (
 	"log"
 	"os"
 	"runtime/debug"
-	"strconv"
-	"time"
 
 	"github.com/StackExchange/dnscontrol/v3/commands"
+	"github.com/StackExchange/dnscontrol/v3/pkg/version"
 	_ "github.com/StackExchange/dnscontrol/v3/providers/_all"
 )
 
@@ -19,36 +18,5 @@ func main() {
 	if info, ok := debug.ReadBuildInfo(); !ok && info == nil {
 		fmt.Fprint(os.Stderr, "Warning: dnscontrol was built without Go modules. See https://github.com/StackExchange/dnscontrol#from-source for more information on how to build dnscontrol correctly.\n\n")
 	}
-	os.Exit(commands.Run(versionString()))
-}
-
-// Version management. Goals:
-// 1. Someone who just does "go get" has at least some information.
-// 2. If built with build/build.go, more specific build information gets put in.
-// Update the number here manually each release, so at least we have a range for go-get people.
-var (
-	SHA       = ""
-	Version   = "3.3.0"
-	BuildTime = ""
-)
-
-// printVersion prints the version banner.
-func versionString() string {
-	var version string
-	if SHA != "" {
-		version = fmt.Sprintf("%s (%s)", Version, SHA)
-	} else {
-		version = fmt.Sprintf("%s-dev", Version) // no SHA. '0.x.y-dev' indicates it is run from source without build script.
-	}
-	if info, ok := debug.ReadBuildInfo(); !ok && info == nil {
-		version += " (non-modules)"
-	}
-	if BuildTime != "" {
-		i, err := strconv.ParseInt(BuildTime, 10, 64)
-		if err == nil {
-			tm := time.Unix(i, 0)
-			version += fmt.Sprintf(" built %s", tm.Format(time.RFC822))
-		}
-	}
-	return fmt.Sprintf("dnscontrol %s", version)
+	os.Exit(commands.Run("dnscontrol " + version.VersionString()))
 }