Use lxc-stop -k when lxc-kill is not found

lxc-kill was removed in lxc/lxc@33ddfc2

Docker-DCO-1.1-Signed-off-by: Chia-liang Kao <clkao@clkao.org> (github: clkao)
Merge pull request #3842 from jpoimboe/iptables-insert-masq

network: insert masq rule
 Fix fun Travis DCO check YAML parsing issues (especially with commit messages that start with any kind of whitespace, like this one intentionally does)

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
refactor all *FromJob functions

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
Merge pull request #3833 from vieux/fix_env_conversion_issues

Fix env conversion issues in env
remove TestAllocateTCPPortLocalhost faillure in tests

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
Merge pull request #3854 from vieux/fix_tests

remove TestAllocateTCPPortLocalhost faillure in tests
fix TestExitCode

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
Remove all darwin specific files and use more generic _unsupported with build tags.
Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume.charmes@docker.com> (github: creack)
- Fixed the last cli.call's parameter from CmdSearch

Docker-DCO-1.1-Signed-off-by: Roberto Hashioka <roberto.hashioka@docker.com> (github: rogaha)
Merge pull request #3859 from rogaha/add_missing_attributes

- Fixed the last cli.call's parameter from CmdSearch
add make test-integration

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
Merge pull request #3858 from vieux/fix_testexitcode

fix TestExitCode
Fixed link to kernel dependencies. Wrapped long lines. Removed old tar dependency from list.
Docker-DCO-1.1-Signed-off-by: Andy Rothfusz <github@developersupport.net> (github: metalivedev)
Merge pull request #3758 from metalivedev/2720-running

Fixes 2720
Merge pull request #3860 from vieux/integration_makefile

Add "make test-integration"
vagrant: added PRIVATE_NETWORK env var

Docker-DCO-1.1-Signed-off-by: Rafal Jeczalik <rjeczalik@gmail.com> (github: rjeczalik)
changed default value of getenvint to 0. fix tests

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
use exists

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
add a known issue for lxc-1.0.0.beta3 and beyond for removeal of lxc-kill see #3844

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)