Allow / as source of -v

We discussed this at the docker plumbers meetup and for tools and
working on the system for things like boot2docker and coreos this is
needed.  You can already bypass this check so we felt it is ok to start
allowing this feature.
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
Remove api test for bind mount /
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
Adds check if default ip address is correct format.

It avoids hidden error when ports are redirected from
container to host using -p host_port:guest_port.

Docker-DCO-1.1-Signed-off-by: Jiří Župka <jzupka@redhat.com> (github: jzupka)
Merge pull request #6701 from crosbymichael/mount-root

Allow / as source of -v
correct typo - desination -> destination

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
integcli: add test to ensure -v /:/ isn't allowed

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Merge pull request #6234 from jzupka/fix_check_default_ip

Adds check if default ip address is correct format.
Merge pull request #6735 from unclejack/add_test_pr-6701

Add test for PR 6701