windows: add net user enum

[JoeyShapiro]

In the go windows package, you can get user information by using
NetUserGetInfo along with a specified level. However, there is
no way to get a list of the users.
The only options are to

1. know the users,
2. brute force users, or
3. use an external tool or command (net users).

I suggest adding a function that implements the windows api for
NetUserEnum. This will allow a built in way to enumerate
users and follow the standard.

A side note is that I used buf **byte because
it is how the others are done, but using buf *byte
works just as well.

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Patch Set 1:

(1 comment)

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Message from Alex Brainman:

Patch Set 1:

(3 comments)

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Message from Joey Shapiro:

Patch Set 1:

(2 comments)

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Message from Alex Brainman:

Patch Set 3: Code-Review+2 Commit-Queue+1

(2 comments)

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Patch Set 3:

Dry run: CV is trying the patch.

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Patch Set 3: -Commit-Queue

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Patch Set 3:

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Patch Set 3: Code-Review+1

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Patch Set 3: Code-Review+1

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This PR is being closed because golang.org/cl/578475 has been merged.