Merge ^/head r337646 through r338014.

libbe(3): Prefer safer versions of strcat/strcpy

Or, in the activate case, just use snprintf since that's effectively what
we're doing anyways.

libbe(3)/bectl(8): Hit rewind on a bunch of off-by-ones

While here, use sizeof() in some places that it makes sense to reduce room
for error and prefer strlcpy to strncpy

libbe(3): Fix leaky faucets

Amongst them:
- Resource leaks
- Logically dead code
- Unused values
- Null termination issues

Reported by: asomers (pointer to Coverity), Coverity
CID: 1394777, 139479

libbe(3): Fix leaky faucets

Amongst them:
- Resource leaks
- Logically dead code
- Unused values
- Null termination issues

Reported by: asomers (pointer to Coverity), Coverity
CID: 1394777, 1394791, 1394830, 1394844, 1394872, 1394894,
CID: 1394900, 1394907, 1394950, 1394965

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Merge libbe(3)/bectl(8) from projects/bectl into head

bectl(8) is an administrative interface for working with ZFS boot
environments, intended to provide a superset of the functionality provided
by

Merge libbe(3)/bectl(8) from projects/bectl into head

bectl(8) is an administrative interface for working with ZFS boot
environments, intended to provide a superset of the functionality provided
by sysutils/beadm.

libbe(3) is the back-end library that the required functionality has been
pulled out into for later reuse.

These were originally written for GSoC 2017 under the mentorship of
allanjude@.

bectl(8) has proven pretty stable in my testing, with the known bug
documented in the man page.

Relnotes: yes

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libbe(3)/bectl(8): Standardize $FreeBSD$ IDs

libbe(3)/bectl(8): Standardize copyright headers

- File names don't necessarily need to be repeated
- Add SPDX tags
- Add a missing copyright for Kyle Kneitinger in bectl.8, originally written
by

libbe(3)/bectl(8): Standardize copyright headers

- File names don't necessarily need to be repeated
- Add SPDX tags
- Add a missing copyright for Kyle Kneitinger in bectl.8, originally written
by him in GSoC 2017; his standard copyright notice has been copied from
other files within the same directory to remain consistent with how he
clearly wished to portray it

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libbe(3): Return some more proper error codes

bectl(8): Take origin snapshot into account when calculating used space

This more closely matches the behavior for beadm. The associated libbe(3)
API is still getting worked out a little bit.

libbe(3): Add be_mounted_at to check a mount point

At a bare minimum, this function will return 0 if a BE is mounted at the
given path or non-zero otherwise. If the optional 'details' nvlist is
sup

libbe(3): Add be_mounted_at to check a mount point

At a bare minimum, this function will return 0 if a BE is mounted at the
given path or non-zero otherwise. If the optional 'details' nvlist is
supplied, it is filled with an nvpair containing just the information about
the BE mounted at the path. This nvpair is structured just as it is for
be_get_bootenv_props, except limited to just the single mount point.

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libbe(3)/be(8): Drop WARNS overrides, fix all fallout

Based on the idea that we shouldn't have all-new library and utility going
into base that need WARNS=1...

- Decent amount of constification
- L

libbe(3)/be(8): Drop WARNS overrides, fix all fallout

Based on the idea that we shouldn't have all-new library and utility going
into base that need WARNS=1...

- Decent amount of constification
- Lots of parentheses
- Minor other nits

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libbe(3): make style consistent with what I'll use going forward

Import libbe(3)/be(1) from socsvn/soc2017/kneitinger/libbe-head