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)
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 #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