Numerous small fixes, mostly suggested by Coverity.

tests/sys/kern/unix_seqpacket_test.c
	* Remove a duplicate error check in mk_pair_of_sockets
	* Always close sockets in the success path of ATF test cases.  Don't
	  bother with the error paths, because those are mostly assertions
	  anyway.  Most of these socket leaks were reported by Coverity.
	  All of them are harmless, because each ATF test case runs in its
	  own process.
	* Fix the len argument to send in shutdown_send and
	  shutdown_send_sigpipe.  The old version was using sizeof a pointer
	  instead of sizeof the char array.  Reported by Coverity.
	* Change a few ATF_CHECK to ATF_REQUIRE if the test can't reasonably
	  continue past a failure.

Reported by:	Coverity Scan
CID:		1229995, 1229991, 1229988, 1229994, 1229989, 1229992
CID:		1229993, 1229990, 1229984, 1229967, 1230005, 1229977
CID:		1229966, 1230004, 1229976
MFC after:	1 week
Sponsored by:	Spectra Logic
Another rpund of fixes, after checking keymaps for plausibility and with
several updates to the converter tools. There is now support for hybrid
source keymaps, which e.g. use ISO8859-1 (not -15) but still provide an
Euro key (on the "E" key). ISO8859-1 currency symbols on other keys are
still converted to that character, not the Euro sign. A similar hack was
applied to the Japanese keyboards to add the Yen key, that could not be
expressed in SYSCONS.

Several modifications have been applied after the conversion (removal of
unused accents tables, some reformatting, exchange of a few key symbols).

The German keymap (de.kbd) is now using deadkeys only for those keys,
that behave that way under Windows. There are now ".acc" and ".noacc"
variants, which use deadkeys vs. nodeadkeys for all accent keys.

I'm still in the process of comparing keymaps that existed in different
encodings in SYSCONS. These are generally translated slightly differently,
either because of mistakes, or because of different preferences, or due
to limitations of the respective encoding.

MFC after:	3 days
Rewrite of ti_i2c based on gonzo's patch, fix the following bugs/problems:

  . interrupt storm detected on "intr70:"; throttling interrupt source;

  . Added access serialization on iicbus_transfer(), previously there was
    no such protection and a new transfer could easily confuse the
    controller;

  . Add error checkings (i.e. stop the transfer when a error is detected
    and do _not_ overwrite the previous error);

  . On command done interrupt do not assume that the transfer was finished
    sucessfully as we will receive the command done interrupt even after
    errors;

  . Simplify the FIFO handling;

  . Reset the FIFO between the transfers as the FIFO may contain data from
    the last (failed) transfer;

  . Fix the iicbus speed for AM335x, which in turn will make better use of
    the I2C noise filter (set to one internal clock cycle);

  . Move the read and write handler to ithread instead of notifying the
    requesting thread with wakeup(9);

  . Fix the comments based on OMAP4 TRM.

The above changes allows me to read the EDID from my HDMI monitor on BBB
with gonzo's patches to support TDA19988 (which does 128 bytes reads) and
repeatedly scan the iicbus (with a modified i2c(8)) without lock up the bus.

Phabric:	D465
Misc fixes suggested by Coverity.

sbin/devd/tests/client_test.c
	* In the event that popen fails, don't dereference its return value.
	* Fix array overwrite in the stream and seqpacket tests.
	* Close sockets at the end of successful ATF tests.

Reported by:	Coverity scan
CID:		1232019, 1232020, 1232029, 1232030
MFC after:	1 week
Sponsored by:	Spectra Logic
The conversion tools have been further improved and some erroneous
conversions have been detected and fixed.

It is now possible to add options after the encoding in the parameter
list for convert-keymap.pl. This is currently used to selectively
enable interpretation of the ISO8859-1 currency symbol as the Euro
sign found in ISO5589-15, or to add a Yen symbol in place of '\' for
specific Japanese keyboards. The option are appended to the parameter
list, as in e.g. "convert-keymap.pl german.iso.kbd ISO5589-1 EURO".

The options are appended to the encoding in the form "+EURO" or "+YEN"
in KBDFILES.map, to keep the meaning of the columns intact.

MFC after:	3 days