MFC r310118

Fix ls_tests:o_flag with ZFS TMPDIR

Unlike UFS or TMPFS, ZFS sets uarch automatically whenever a file is
updated. The test must explicitly clear uarch to be portable across
filesystems. Also, it doesn't need to run as root.

MFC r300939:

Use require.progs with bc instead of require.files with /usr/bin/bc

This will make things more flexible if the program path changes in the future,
and the test in and of itself doesn't call /usr/bin/bc -- it just calls bc

MFC r291919:

Enable bin/ls testcases disabled previously because of issues with how
kyua 0.11's version of report-junit was rendering non-printable characters

Upgrade to kyua 0.12 to obtain a fixed version of the command

Output verified with python 2.7.10's xml.dom.minidom module

Sponsored by: EMC / Isilon Storage Division

MFC r288330,r288423,r288678,r288905,r288906,r288907,r289102:

r288330:

Add initial testcases for bin/ls

Sponsored by: EMC / Isilon Storage Division

r288423:

Skip the B_flag testcase to stop blowing up freebsd-current@ with
"test failure emails" because kyua report-jenkins doesn't properly
escape non-printable chars

r288678:

Merge additional testcases and improvements to bin/ls/ls_tests from
^/user/ngie/more-tests.

- Additional testcases added:
-- ls -D
-- ls -F
-- ls -H
-- ls -L
-- ls -R
-- ls -S
-- ls -T
-- ls -b
-- ls -d
-- ls -f
-- ls -g
-- ls -h
-- ls -i
-- ls -k
-- ls -l
-- ls -m
-- ls -n
-- ls -o
-- ls -p
-- ls -q/ls -w
-- ls -r
-- ls -s
-- ls -t
-- ls -u
-- ls -y
- Socket file creation is limited to the ls -F testcase, greatly speeding up
the test process
- The ls -C testcase was made more robust by limiting the number of columns
via COLUMNS and by dynamically formulating the columns/lines.
- Add `atf_test_case` before all testcase `head` functions.

Sponsored by: EMC / Isilon Storage Division

r288905:

Add some more syncs to quiesce the filesystem after creating the
files to see if this fixes deterministic Jenkin failures

r288906:

Explicitly set BLOCKSIZE to 512 in the environment

r288907:

Call sync consistently using atf_check

Remove superfluous sync's

r289102:

Remove all of the syncs

They're unnecessary as shown by further testing on my VM

Requested by: jhb