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

pkg/version/version.go

@@ -0,0 +1,47 @@
+package version
+
+import (
+	"fmt"
+	"runtime/debug"
+	"strconv"
+	"time"
+)
+
+// 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 = ""
+)
+
+var versionCache string
+
+// VersionString returns the version banner.
+func VersionString() string {
+	if versionCache != "" {
+		return versionCache
+	}
+
+	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))
+		}
+	}
+
+	versionCache = version
+	return version
+}