remove dockerscript

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
refactor TruncIndex to use a trie & vendor deps

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Remove integration tests moved to integration-cli(dups)

integration/commands_test.go/TestRunHostname == integration-cli/docker_cli_run_tests.go/TestModeHostname
integration/commands_test.go/TestRunWorkdir  == integration-cli/docker_cli_run_tests.go/TestDockerRunWorkingDirectory
integration/commands_test.go/TestRunWorkdirExists  == integration-cli/docker_cli_run_tests.go/TestDockerRunWorkingDirectory
integration/commands_test.go/TestAttachstdIn == integration-cli/docker_cli_run_tests.go/TestRunStdinPipe
integration/commands_test.go/TestCmdLogs     == integration-cli/docker_cli_logs_tests.go
integration/commands_test.go/TestCmdKill     == integration-cli/docker_cli_kill_test.go

Docker-DCO-1.1-Signed-off-by: Brian Goff <cpuguy83@gmail.com> (github: cpuguy83)
Merge pull request #6625 from vieux/remove_dockerscript

remove dockerscript
Merge pull request #6696 from cpuguy83/remove_dup_run_tests

Remove integration tests moved to integration-cli(dups)
Merge pull request #6657 from unclejack/refactor_truncindex

refactor TruncIndex to use a trie & vendor deps
Update libcontainer to 53cfe0a1eba9145bf5329abbb52
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
Update libcontainer Context changes
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)