[#249] adm: Drop subnet support

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

cmd/frostfs-adm/internal/modules/morph/initialize_deploy.go

@@ -47,7 +47,6 @@ const (
 	frostfsIDContract  = "frostfsid"
 	netmapContract     = "netmap"
 	proxyContract      = "proxy"
-	subnetContract     = "subnet"
 )
 
 var (
@@ -58,7 +57,6 @@ var (
 		frostfsIDContract,
 		netmapContract,
 		proxyContract,
-		subnetContract,
 	}
 
 	fullContractList = append([]string{
@@ -593,7 +591,6 @@ func (c *initializeContext) getContractDeployData(ctrName string, keysParam []an
 			configParam)
 	case proxyContract:
 		items = nil
-	case subnetContract:
 	default:
 		panic(fmt.Sprintf("invalid contract name: %s", ctrName))
 	}