tests: avoid warnings due to new filefrag -v format

* tests/cp/sparse-fiemap.sh: Newer versions of filefrag output
more fields, in different orders, so handle that to avoid warnings.
tests: df/total-unprocessed: fix false failure with lofs

* tests/df/total-unprocessed.sh: Skip the test when we can't
determine the file system type as the exclusion filter is not
applied in that case.  "lofs" being ignored is effectively
an unknown file system type.
doc: fix typo in numfmt invocation

* doc/coreutils.texi (numfmt invocation): s/nun/num/.
Fixes http://bugs.gnu.org/16122
build: default to avoiding openssl system libraries

* configure.ac: Don't change the gnulib default of 'no' for
whether to link with openssl system libraries if available.
Distributions can explicitly enable this as their policy allows.
* NEWS: Adjust accordingly.
tests: restrict cp --link inode comparisons to compatible systems

* tests/cp/link-deref.sh: On systems were cp can't determine if
gnulib linkat() emulation might create a symlink instead of a hardlink
to a symlink, copy.c will create a symlink to the symlink so that
it has more control over its metadata.  Also even if the system
supports this operation, the particular file system under test may not.
So avoid the hardlinked symlink verification in these cases.
This fixes a false failure on aix, solaris and freebsd.
tests: avoid unlikely deadlock in dd/no-allocate on some shells

* test/dd/no-allocate.sh: Use 'wait' to ensure we don't have
multiple writers to the fifo, which was seen to trigger
a very hard to reproduce deadlock with make -j20 on solaris.
Also avoid writing to the fifo with the shell; instead using dd.
(check_dd_seek_alloc): A new function refactored from the various
cases, which are now constructed from function parameters.
stat,tail: improve support for hostfs and smackfs

hostfs is provided by the Linux UML subsystem.
smackfs is provided by the Linux Smack security module.

* src/stat.c (human_fstype): Add new file system ID definitions.
* NEWS: Mention the improvement, and adjust for the fact that
SNFS is a remote file system.
version 8.22

* NEWS: Record release date.
maint: post-release administrivia

* NEWS: Add header line for next release.
* .prev-version: Record previous version.
* cfg.mk (old_NEWS_hash): Auto-update.