ngctl: Check hook name length

Check the length of the hook name when copying it into the sockaddr.

MFC after: 1 week
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D55258

ngctl: Modernize code somewhat

* Replace fgets(3) with getline(3)

* Replace select(2) with poll(2)

* Avoid needlessly copying text around

* Correct use of getopt(3)

* Pick some style and whitesp

ngctl: Modernize code somewhat

* Replace fgets(3) with getline(3)

* Replace select(2) with poll(2)

* Avoid needlessly copying text around

* Correct use of getopt(3)

* Pick some style and whitespace nits

MFC after: 1 week
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D55257

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Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

Style: space after "return".

Unnest includes before forthcoming editing.

Add ngctl "write" command.

MFC after: 1 week

Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

Style: space after "return".

Unnest includes before forthcoming editing.

Add ngctl "write" command.

MFC after: 1 week

Style: space after "return".

Unnest includes before forthcoming editing.

Add ngctl "write" command.

MFC after: 1 week