Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

MFp4:
o Add mount and umount actions so that partitions can be in use.
o Extend the testing of the add verb to include overlapping
partitions.
o Add tests for the remove verb. this includes tests to remove
a partition when in use (i.e. is mounted).
o Add a MD5 checksum to the output of the conf action so that
it can be tested. Make sure the MD5 doesn't vary based on
certain dynamic behaviour that is irrelevant to the output.
o Add MD5 checksums to the expected result of conf actions.

MFp4:
Add support for read-write parameters. Allow an optional initializer
for read-write parameters. Print the value of those parameters on
success following the PASS.

Update to match geom_gpt:1.35

o Change the result of gctl(001) now that a bogus verb still requires
a valid geom,
o Insert gctl(024) to test for an appropriate error when a bogus verb
is given that does have a proper geom parameter.

Instead of saving the unit number of the md(4) device name, save the
whole name. This does not unnecessarily close the door that in some
future we want to test on something other than md(4) devices.

Also add a "conf" action so that we can check whether a gctl actually
did the right thing or not. It's one thing to check that the result
strings are as expected, but it doesn't tell us if the end result is
correct. This needs a bit more fleshing out, but for now a visual
(i.e. manual) check suffices.

Rough implementation of the create and add verbs. The verbs cause
in-memory changes only and as such are only useful for prototyping
and regression testing purposes.

o Extend the suite to run more than just the driver. We need to run
mdconfig(8), because we need a disk to work on.
o Extend the number of tests now that we have a disk.
o Simplify the driver. All parameters are ASCII strings now.

Add the beginnings of a testsuite for testing GPT control requests.
The testsuite is based on a simple driver program that builds a
request from the arguments passed to it and issues the request to
Geom. The driver emits FAIL with the error string or PASS depending
on whether the request completed with an error or not. A -v option
has been added to the driver and causes the request to be dumped.
The -v option to prove(1) controls the -v option to the driver.

The testsuite itself contains a hash of which the key constitutes
the arguments and the value is the expected result.