- Exclude intel 32 bits arch. Docker does not built on that. Let's
make it explicit.

- rediff ignore-dockerinit-checksum.patch, gcc-go-build-static-libgo.patch
to make them apply again.
- introduce go_arches for architectures that use the go compiler
instead of gcc-go
- add docker-netns-aarch64.patch: Add support for AArch64
- enable build for aarch64

- Build man pages only on platforms where gc compiler is available.

- Updated to 1.7.0 (2015-06-16) - bnc#935570
* Runtime
- Experimental feature: support for out-of-process volume plugins
- The userland proxy can be disabled in favor of hairpin NAT using the daemon’s `--userland-proxy=false` flag
- The `exec` command supports the `-u|--user` flag to specify the new process owner
- Default gateway for containers can be specified daemon-wide using the `--default-gateway` and `--default-gateway-v6` flags
- The CPU CFS (Completely Fair Scheduler) quota can be set in `docker run` using `--cpu-quota`
- Container block IO can be controlled in `docker run` using`--blkio-weight`
- ZFS support
- The `docker logs` command supports a `--since` argument
- UTS namespace can be shared with the host with `docker run --uts=host`
* Quality
- Networking stack was entirely rewritten as part of the libnetwork effort
- Engine internals refactoring
- Volumes code was entirely rewritten to support the plugins effort
- Sending SIGUSR1 to a daemon will dump all goroutines stacks without exiting
* Build
- Support ${variable:-value} and ${variable:+value} syntax for environment variables