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)