Rename "shellshock" to "cve-2014--shellshock"

This makes room for more "cve-xxxx-yyyy--zzzzz" style test names in the future, making it more clear what the purpose is, especially as we grow our test suite.

(Like the "cve-2014-9680--sudo-tz" I'm contemplating if it ever gets fixes released.)

test/config.sh

@@ -3,7 +3,7 @@ set -e
 
 globalTests=(
 	utc
-	shellshock
+	cve-2014--shellshock
 )
 
 declare -A testAlias=(