scripts: Add wget to prereqs

Should be an nop for gLinux machines (preinstalled). This is for the
non-corp machines or CI.

Change-Id: If1b8d9360512c0276351fc17f8903a10dc842f9d

install-prereqs.sh

diff --git a/install-prereqs.sh b/install-prereqs.sh
index 14d8e17..a920904 100755
--- a/install-prereqs.sh
+++ b/install-prereqs.sh
@@ -79,6 +79,7 @@
     uml-utilities
     policykit-1
     screen
+    wget
     zlibc
     zlib1g
     zlib1g-dev