Fix duplicate iptables rules

If iptables version is < 1.4.11, try to delete the rule vs. checking if it exists. Fixes #6831.

Docker-DCO-1.1-Signed-off-by: Jessica Frazelle <jfrazelle@users.noreply.github.com> (github: jfrazelle)
Add an option to disable IP masquerading

For the cases where --bip option is used it is sometimes best to disable
IP masquerading as the provided bridge IP range may be routable.

Signed-off-by: Eugene Yakubovich <eugene.yakubovich@coreos.com>
Add docker-exec to main manpage

Docker-DCO-1.1-Signed-off-by: Jessica Frazelle <jess@docker.com> (github: jfrazelle)
Add a little description of the image tarball format.

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)
'an file' -> 'a file' grammar fix

Signed-off-by: Albert Callarisa Roca <albert@acroca.com>
boot2docker shellinit will set any and all env vars needed.

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)
Merge pull request #8111 from acroca/master

Grammar fix
Merge pull request #8061 from SvenDowideit/document-image-tarball-format

Add a little description of the image tarball format.
Merge pull request #6950 from jfrazelle/6831-check-flag-centos6.5

Fix duplicate iptables rules
Merge pull request #7694 from eyakubovich/master

Add an option to disable IP masquerading
Add support for copy/add with multiple src files

Part one of solution for issue #6820

Signed-off-by: Doug Davis <dug@us.ibm.com>
Merge pull request #8116 from SvenDowideit/use-boot2docker-shellinit

boot2docker shellinit will set any and all env vars needed.
Merge pull request #8091 from jfrazelle/exec-main-manpage

Add docker-exec to main manpage
Merge pull request #8076 from duglin/MultiCopyAdd

Add support for copy/add with multiple src files
FIX 6613:launch docker fail with space named drive

Signed-off-by: Guillaume Dufour <guillaume.duff@gmail.com>
Signed-off-by: Tibor Vass <teabee89@gmail.com>
Add support for multiple level CLI commands

E.g. "docker groups create" will attempt to call the function
CmdGroupsCreate

Signed-off-by: Ben Firshman <ben@firshman.co.uk>
Use prefix naming for docker_cli_run_test.go

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Use prefix naming for events test

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Use prefix naming for inspect tests

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Use prefix naming for attach tests

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>