tools/pw-update.sh: Adjust primary group of new users only necessary

When the primary group of new user exists, just use it, and thus avoid
unnecessary group adjustments for new users.

tools/pw-update.sh: Allow to create user 'toor' of duplicate UID

The 'toor' user has duplicate UID of 0 as 'root', and it also has an
empty shell field. This caused problem for the 'pw-update.sh' t

tools/pw-update.sh: Allow to create user 'toor' of duplicate UID

The 'toor' user has duplicate UID of 0 as 'root', and it also has an
empty shell field. This caused problem for the 'pw-update.sh' to
handle. If the user/admin deliberately removed the 'toor' user, then
this script was unable to add it back, which breaks the 'preinstall'
target and thus 'installworld' failed.

Use the '-o' option for 'pw useradd' to allow to create users of
duplicate UIDs. In addition, quote the shell field to handle the empty
case.

Bug: https://bugs.dragonflybsd.org/issues/3332

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tools/pw-update.sh: No need to invoke pwd_mkdb(8)

The pw(8) utility already handles the database update, so no need to
manually invoke the pwd_mkdb(8).

tools/pw-update.sh: Improve to update user/group

Before this change, this script would only add new users and/or groups,
but wouldn't modify existing users/groups. This change add this
ability.

tools: Add pw-update.sh to add new users and groups

This script is derived my 'dfly-update' tool [1], and will be used in
'make upgrade' to help add new users and groups.

[1] https://github.com/liw

tools: Add pw-update.sh to add new users and groups

This script is derived my 'dfly-update' tool [1], and will be used in
'make upgrade' to help add new users and groups.

[1] https://github.com/liweitianux/dfly-update

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