UTIME_OMIT is only available on Linux

Docker-DCO-1.1-Signed-off-by: Kato Kazuyoshi <kato.kazuyoshi@gmail.com> (github: kzys)
modernise the MAINTAINER process documentation to line up with what I understand it to be

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
devmapper: Properly restore mocked functions after test

Currently the tests that mocks or denies functions leave this state
around for the next test. This is no good if we want to actually
test the devicemapper code in later tests.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
vfs graphdriver: Make root dir mode 755

This matches the other backends.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
graphdriver: Add generic test framework for graph drivers

This adds daemon/graphdriver/graphtest/graphtest which has a few
generic tests for all graph drivers, and then uses these
from the btrs, devicemapper and vfs backends.

I've not yet added the aufs backend, because i can't test that here
atm. It should work though.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
graphdriver: Fail initialization if supported but got error

If a graphdriver fails initialization due to ErrNotSupported we ignore
that and keep trying the next. But if some driver has a different
error (for instance if you specified an unknown option for it) we fail
the daemon startup, printing the error, rather than falling back to an
unexected driver (typically vfs) which may not match what you have run
earlier.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
grapdriver: Skip tests on non-supported backends

For now this means the btrfs backend is skipped when run
inside make test. You can however run it manually if you want.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
Fixing pre-commit-msg URL

URL referred to raw.github.com instead of raw.githubusercontent.com. Fixed.

Docker-DCO-1.1-Signed-off-by: Aaron Huslage <huslage@gmail.com> (github: huslage)
Add Licensing information to README

Docker-DCO-1.1-Signed-off-by: Vincent Mayers vince.mayers@gmail.com (github: vincentmayers)
[solomon@docker.com: rephrased commit message and transcribed signoff]
Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
the last remaining raw.github.com URL's

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
changed deprecated option styles to supported ones

-name and -rm to --name and --rm
archive: use bufio for compression detection

Docker-DCO-1.1-Signed-off-by: Johan Euphrosine <proppy@google.com> (github: proppy)
Add "cross" to the "test" Makefile target

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Merge pull request #5826 from tianon/add-cross-to-test

Add "cross" to the "test" Makefile target
Merge pull request #5820 from joelhandwell/patch-1

changed deprecated option styles to supported ones
Merge pull request #5823 from proppy/archive-bufio

archive: use bufio for compression detection
Merge pull request #5732 from SvenDowideit/pr_out_the_last_remaining_raw_github_com_url_s

the last remaining raw.github.com URL's
Merge pull request #5802 from shykes/pr_out_add_licensing_information_to_readme

Add Licensing information to README
Merge pull request #5461 from SvenDowideit/getmaintainers.sh
Merge pull request #5454 from kzys/utime-omit

UTIME_OMIT is only available on Linux