bugtool: Capture memory fragmentation info from /proc

This information can be useful to understand why memory allocation in
the kernel may fail (ex. for maps or for XFRM). I've checked that these
two files are accessible from a typical cilium-agent deployment (on
GKE).

Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>

bugtool/cmd/configuration.go

@@ -285,6 +285,8 @@ func catCommands() []string {
 	files := []string{
 		"/proc/sys/net/core/bpf_jit_enable",
 		"/proc/kallsyms",
+		"/proc/buddyinfo",
+		"/proc/pagetypeinfo",
 		"/etc/resolv.conf",
 		"/var/log/docker.log",
 		"/var/log/daemon.log",