Terraform: Update default configuration for Odin (#520)

Same changes as in #510 minus the RC suffix. Just makes it more straightforward for local builds.

etc/terraform.conf

@@ -2,16 +2,16 @@
 ARCH="amd64"
 
 # base codename
-BASECODENAME="bionic"
+BASECODENAME="focal"
 
 # base version
-BASEVERSION="18.04"
+BASEVERSION="20.04"
 
 # distribution codename
-CODENAME="hera"
+CODENAME="odin"
 
 # distribution version
-VERSION="5.1"
+VERSION="6.0"
 
 # distribution channel
 CHANNEL="stable"
@@ -24,10 +24,10 @@ MIRROR_URL="http://azure.archive.ubuntu.com/ubuntu/"
 
 # use HWE kernel and packages?
 HWE_KERNEL="yes"
-HWE_X11="yes"
+HWE_X11="no"
 
 # use appcenter ppa
-INCLUDE_APPCENTER="yes"
+INCLUDE_APPCENTER=""
 
 # suffix for generated .iso files
 OUTPUT_SUFFIX=""