dhcpcd hiccups in -current

["John D. Baker" <jdbaker%consolidated.net@localhost>]

With the recent update of dhcpcd with privsep and chroot, I observed a
couple of hiccups in the update process ('etcupdate').

Although "/etc/master.passwd" is updated to add the "_dhcpcd" user, the
insecure "/etc/passwd" is not regenerated to reflect this addition.  Thus,
later 'postinstall ... fix dhcpcd' prompts 'file -user ...' to complain
about "_dhcpcd: no such user".

This is also seen on subsequent boot when configuring network interfaces.
The complaint of "No such user _dhcpcd" is displayed.

Regenerating "/etc/passwd" (and "{,s}pwd.db"?) by running 'vipw' and simply
exiting with ":wq" (or 'pwd_mkdb'?) resolves this issue.

The following is also seen when bringing up an interface:

  Configuring network interfaces: <if>dhcpcd_fork_cb: truncated read 0 (expected 4)
.

This is on NetBSD/sparc-9.99.56 from soures of 202004190030Z.

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