misc/53669: Lingering references to dhclient(8) in documentation

[david%gutteridge.ca@localhost]

>Number:         53669
>Category:       misc
>Synopsis:       Lingering references to dhclient(8) in documentation
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    misc-bug-people
>State:          open
>Class:          doc-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Oct 14 23:25:00 +0000 2018
>Originator:     David H. Gutteridge
>Release:        current
>Organization:
>Environment:
>Description:
There are some lingering references to dhclient in documentation:

ifwatchd.8: Paragraphs about it handing carrier detection on interfaces
to control dhclient. I believe dhcpcd handles this itself.

btpand.8: Has an example for calling dhclient on a newly created
interface. Also includes an xref to a now non-existent dhclient.8 man
page.

pf.boot.conf: Makes reference to specific configuration considerations
for dhclient. I imagine this isn't of particular concern since PF
itself is deprecated.

(Also, there are still two PRs open about dhclient issues:

bin/39292
bin/52403, where the submitter has indicated it can be closed.)

>How-To-Repeat:
See first three results in:
https://nxr.netbsd.org/search?q=dhclient&project=src&defs=&refs=&path=&hist=
>Fix: