replace 127.0.0.1 by the assigned IP address in the container's /etc/hosts file.
change 127.0.0.1 -> 127.0.1.1 & remove ::1 -> hostname mapping
Merge remote-tracking branch 'upstream/master'

Conflicts:
	container.go
Container memory limit can be specified in kilobytes, megabytes or gigabytes

    -m 10  # 10 bytes
    -m 10b # 10 bytes
    -m 10k # 10240 bytes (10 * 1024)
    -m 10m # 10485760 bytes (10 * 1024 * 1024)
    -m 10g # 10737418240 bytes (10 * 1024 * 1024 * 1024)

Units are case-insensitive, and 'kb', 'mb' and 'gb' are equivalent to 'k', 'm' and 'g'.
Add known issues to sections via new "issues" extension.
Add known issues. Fix build warnings.
lock around read operations in graph

Writes and reads will fail with ErrBusy if there's
concurrent reads or writes, respectively. It is
not sufficient to only lock around writes.
gograph: Use RWMutex to allow concurrent readers
gograph: allow Walk() reentrance

Hold the read lock while reading the child graph,
then walk over the children without any lock, in
order to avoid deadlock.
Update documentation to reflect changes in Config and HostConfig
testing infrastructure, issue #1800: Refactor docker testing using Docker in Docker
docker-ci 0.35. Push docker coverage and testing into docker-ci production. Update docker nightlyrelease
docker-ci 0.36. Patch hack/dind with latest code for nightly release to work.
docker-ci 0.37. Patch hack/dind with latest code for docker-test.
docker-ci 0.40. Migrate docker-ci to Digital Ocean.
docker-ci 0.4.5: Sync tests with progress in docker and docker-registry. Use revamped shiny DinD.
Fix 2585 and clean up warning in contributing.rst
network: add iptables rules to explicitly allow forwarding

Explicitly enable container networking for Fedora and other distros that
have a REJECT all rule at the end of their FORWARD table.
fix mergeConfig with new ports
Deprecate old tagging format