Add client version to the client app and send it to the management service (#218)

* moved wiretrustee version from main to system.info

* added wiretrustee version for all supported platforms

* typo corrected

* refactor: use single WiretrusteeVersion() func to get version of the client

Co-authored-by: braginini <bangvalo@gmail.com>

client/cmd/version.go

@@ -1,14 +1,16 @@
 package cmd
 
-import "github.com/spf13/cobra"
+import (
+	"github.com/spf13/cobra"
+	"github.com/wiretrustee/wiretrustee/client/system"
+)
 
 var (
-	Version    string
 	versionCmd = &cobra.Command{
 		Use:   "version",
 		Short: "prints wiretrustee version",
 		Run: func(cmd *cobra.Command, args []string) {
-			cmd.Println(Version)
+			cmd.Println(system.WiretrusteeVersion())
 		},
 	}
 )