MFC r359585, r359587

r359585:
Fix calculation of the recurring weekdays

Both the result of the first_dayofweek_of_year and the target
weekday are zero-based (0 fo sunday) while the target month-day
or year-day is 1-based. Adjust logic accordingly.

Also add testcase for this PR to the kyua test suite

PR: 201062
Submitted by: Richard Narron <comet.berkeley@gmail.com>

r359587:
Remove hardcoded US Election Day from calendar.usholiday

calendar(1) syntax is not capable of representing the rules for the
US Election Day. The hardcoded date was set in r15066 in 1996 and
hasn't changed since then.

PR: 173389
Reported by: Steve Ames <steve@energistic.com>

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Migrate most of tools/regression/usr.bin/ to the new tests layout.

I'm starting with the easy cases. The leftovers need to be looked at a
bit more closely.

Note that this change _does_ modify the code of the old tests. This is
required in order to allow the code to locate the data files in the
source directory instead of the current directory, because Kyua
automatically changes the latter to a temporary directory.

Also note that at least one test is known to be broken here. Actually,
the test is not really broken: it's marked as a TODO but unfortunately
Kyua's TAP parser currently does not understand that. Will have to be
fixed separately.

'prove -r' isn't as smart as grog thought.

Updated tests for changed features.

Submitted by: edwin@

Add regression tests for calendar.

Submitted by: edwin@
PR: bin/113275
MFC after: 2 weeks