Add lsof and sysstat packages to the base system for debugging purposes (#13741)

The lsof and sysstat packages make determining what files/sockets a
program has open a bit easier. This helps if, for example, some
application has a file open that's been deleted from disk.

Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>

build_debian.sh

@@ -398,7 +398,9 @@ sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y in
     jq                      \
     auditd                  \
     linux-perf              \
-    resolvconf
+    resolvconf              \
+	lsof                    \
+	sysstat
 
 # default rsyslog version is 8.2110.0 which has a bug on log rate limit,
 # use backport version