[#1351] cli: Fix connection scheme loss during endpoint parsing

In previous implementation NeoFS CLI app used `network.Address.HostAddr`
as a server URI, which caused scheme loss since host address doesn't
contain it.

Rename `HostAddr` to `URIAddr` and make it to return URI address with
`grpcs` scheme if TLS is enabled. Make `TLSEnabled` unexported since it
was used to provide default `tls.Config` only (it is used by default in
SDK).

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/network/tls_test.go

@@ -24,6 +24,6 @@ func TestAddress_TLSEnabled(t *testing.T) {
 		err := addr.FromString(test.input)
 		require.NoError(t, err)
 
-		require.Equal(t, test.wantTLS, addr.TLSEnabled(), test.input)
+		require.Equal(t, test.wantTLS, addr.isTLSEnabled(), test.input)
 	}
 }