t/qemu-runlinux: Mount bpf and fusectl filesystems

bpf is needed for tools like bpftrace.
fusectl is needed to observe things like /sys/fs/fuse/connections/X/waiting.

t/qemu-runlinux

@@ -49,7 +49,8 @@ if [ $$ == 1 ]; then
 
 	mount -t sysfs      none /sys
 	mount -t debugfs    none /sys/kernel/debug
-	#mount -t bpf        none /sys/fs/bpf
+	mount -t bpf        none /sys/fs/bpf
+	mount -t fusectl    none /sys/fs/fuse/connections
 	mount -t proc       none /proc
 
 	mount -t devtmpfs   none /dev