Reduce code duplication around Write Exclusive persistent reservation.

While there, allow some more commands to pass persistent reservation.

MFC after:	1 week
Remove comment obsoleted by r273730.

MFC after:	1 week
Remove unused function.

Sponsored by:	Yandex LLC
Make assignments to "net.inet.tcp.cc.algorithm" work by fixing a bad
string comparison.

MFC after:	3 days
Reported by:	Jukka Ukkonen <jau789@gmail.com>
Sponsored by:	Mellanox Technologies
bin/dd: Fix incorrect casting of arguments

dd(1) casts many of its numeric arguments from uintmax_t to intmax_t
and back again to detect whether or not the original arguments were
negative. This caused wrong behaviour in some boundary cases:

$ dd if=/dev/zero of=/dev/null count=18446744073709551615
dd: count cannot be negative

After the fix:

$ dd if=/dev/zero of=/dev/null count=18446744073709551615
dd: count: Result too large

PR:		191263
Submitted by:	will@worrbase.com
Approved by:	cognet@
Clarify the documentation of pmcstat:
the -d argument should be passed before -p, -s, -P or -S to be taken in account

Differential Revision:	https://reviews.freebsd.org/D1011
Reviewed by:	adrian, gnn
MFC after:	1 week
Correct a typo: this is the manpage for pthread_cleanup_pop, not push.

Submitted by:	ian
Fix rendering

Submitted by:	brueffer
Preserve limitation of "TCP_CA_NAME_MAX" when matching the algorithm
name.

MFC after:	3 days
Suggested by:	gnn @
Tiny comment fixup.
Do not automatically install routes to link-local and interface-local multicast
addresses.

Obtained from:	Yandex LLC
Sponsored by:	Yandex LLC
bin/dd: revert 273734, as it fails on 32bit platforms

Revert: insufficient testing on 32bit platforms

PR:		191263
Add foo_genassym.c files to DPSRCS so dependencies for them are generated.
This ensures these objects are rebuilt to generate an updated header of
assembly constants if needed.
De-k&r-ify function definitions in kern/kern_resource.c

No functional changes.
Tidy up functions related to uidinfo management.

- reference found uidinfo in uilookup
- reduce nesting by handling shorter cases first
Remove an extra copy of hv_kvp_daemon(8) [1].

While I'm there also correct typos in OptionalObsoleteFiles and add
information of the command line options for hv_kvp_daemon(8).

Reported by:	jmg [1]
Reviewed by:	jmg
MFC after:	2 weeks
Output a summary of optional SVM features in dmesg similar to CPU features.
If bootverbose is enabled, a detailed list is provided; otherwise, a
single-line summary is displayed.

Differential Revision:	https://reviews.freebsd.org/D1008
Reviewed by:	jhb, neel
MFC after:	1 week
Remove bhyve SVM feature printf's now that they are available in the
general CPU feature detection code.

Reviewed by:	neel
Some cxgbe/iw_cxgbe fixes:
- Free rt in c4iw_connect only if it is allocated.
- Call soclose instead of so_shutdown if there is an abort from the peer.
- Close socket and return failure if TOE is not enabled.

Submitted by:	Hariprasad at Chelsio dot com
Sponsored by:	Chelsio Communications
krping: In verbose mode print only first 128 bytes of krping data.

Submitted by:	Hariprasad at Chelsio dot com.
Sponsored by:	Chelsio Communications