Update invirt-console to version 0.2.20

Requested by quentin/root@ATHENA.MIT.EDU

diff --git a/invirt-console b/invirt-console
index e08749a..5faacd2 160000 (submodule)
--- a/invirt-console
+++ b/invirt-console
@@ -1 +1 @@
-Subproject commit e08749a1808a6eb08f7e222306623cc4e0fb5f8c
+Subproject commit 5faacd2fbac2e4d7f1cbf76095707660f25e6bc2