To make sure the etcd watcher works, I changed the replication
controller to use watch.Interface. I made apiserver support watches on
controllers, so replicationController can be run only off of the
apiserver. I made sure all the etcd watch testing that used to be in
replicationController is now tested on the new etcd watcher in
pkg/tools/.

More verbose error on missing field

Change cAdvisor port to 4194.

Add test for AtomicUpdate

This is so it doesn't conflict with the default registry address of
5000.

Add a method to list replication controllers

This is for compatibility with existing tests.

Fix #707 

which cause #707

Allow omitting -machines flag in apiserver

-minion_regexp are specified because it is eventually overwritten by
-minion_regexp.

Version fixes

Detect whether the tree is dirty and append a "-dirty" indication to the
git commit (common practice with other repos, e.g. kernel, docker.)

Properly handle the case where a git tree is not found (e.g. building
from archive.)

In the sed expression, look for the variable to be updated
(commitFromGit) instead of hardcoding a line number.

Tested:

- Built from a dirty tree:
    $ output/go/bin/kubelet -version
    Kubernetes version 0.1, build 2d784c684c75-dirty

- Built from a clean tree:
    $ output/go/bin/kubelet -version
    Kubernetes version 0.1, build 505f23a31172

- Built from an archive:
    $ hack/build-go.sh
    WARNING: unable to find git commit, falling back to commitFromGit = `(none)`
    $ output/go/bin/kubelet -version
    Kubernetes version 0.1, build (none)
Signed-off-by: Filipe Brandenburger <filbranden@google.com>

Tested: Passed -version argument to kubelet (and all other binaries):
  $ output/go/bin/kubecfg -version
  Kubernetes version 0.1, build 6454a541fd56
Signed-off-by: Filipe Brandenburger <filbranden@google.com>

Slightly pause on requests to allow most to finish

Add RestartPolicy to Pod and PodTemplate

Revert the revert and fix tests.

Custom conversion funcs

Currently, every write will result in a 202 (etcd adding a few
ms of latency to each request).  This forces clients to go into
a poll loop and pick a reasonable server poll frequency, which
results in 1 + N queries to the server for the single operation
and adds unavoidable latency to each request which affects their
perception of the service.

Add a very slight (25ms by default) delay to wait for requests
to finish.  For clients doing normal writes this reduces the
requests made against the server to 1.  For clients on long requests
this has no effect.  The downside is that http connections are held
on to for a longer period in high write loads.  The decrease in
perceived latency from the kubecfg is significant.

Clean up pkg/apiserver

third_party: update go-dockerclient

As an example, demonstrate how Env.Key's deprecation ought to work.

Fix names