pf tests: pfsync bulk update test

[kp]

Summary

Test that pfsync works as expected with bulk updates. That is, create
some state before setting up the second firewall. Let that firewall
request a bulk update so it can catch up, and check that it got the
state which was created before it enable pfsync.

PR: 254236
MFC after: 2 weeks

tests/sys/netpfil/pf/pfsync.sh

 
 For example, to install the latest driver:
 
 [source,bash]
 ....
 # pkg install x11/nvidia-driver
 ....
 
-The driver will create a kernel module, which needs to be loaded at system startup. Add the following line to [.filename]#/boot/loader.conf#:
+The driver will create a kernel module, which needs to be loaded at system startup. Add it to `kld_list` in `/etc/rc.conf` by executing:
 
-[.programlisting]
+[source,bash]
 ....
-nvidia_load="YES"
+# sysrc kld_list+=nvidia-modeset
 ....
 
-[NOTE]
-====
-To immediately load the kernel module into the running kernel issue a command like `kldload nvidia`. However, it has been noted that some versions of Xorg will not function properly if the driver is not loaded at boot time. After editing [.filename]#/boot/loader.conf#, a reboot is recommended.
-====
+To immediately load the kernel module into the running kernel issue a command like `kldload nvidia-modeset`.
 
 With the kernel module loaded, you normally only need to change a single line in [.filename]#xorg.conf# to enable the proprietary driver:
 
 Find the following line in [.filename]#/etc/X11/xorg.conf#:
 
 [.programlisting]
 ....
 Driver      "nv"