This reverts commit 1992f5f.

Wrong branch...

Allow SkyDNS to forward queries to other authorities, thereby
create a mesh of SkyDNS server all working together.

Works in theory, lots of hardcoded stuff, but looks quite workable.

Multiple idential RR records should be dedupped so that only one is
left.
I.e.

multiport.th1.kubernetes.local. 3600 IN A   1.1.1.1
multiport.th1.kubernetes.local. 3600 IN A   1.1.1.1

Should return:

multiport.th1.kubernetes.local. 3600 IN A   1.1.1.1

Note: I believe the clients don't really care about this and stuff just
works, but a good server should not be sending out invalid messages.

Also added test case that checks for this. We also dedup the additional
section, but for now there is no test for this.

Fixes #149

Add an Etcd watch and create the function that parses the result and put
them in the stubzone's map so that skydns knows what to do.

Close #154

fix typo: ectd -> etcd

When forwarding queries to another stub add a custom EDNS0 option
that tell SkyDNS that this is a stub forward. Such queries will be
handled as normal, except that they won't be forward *again* to
another stub. This should prevent all kind of nasty cycles.

Stubzones

The lookup happens with a lowercased path. Add two more tests
to make sure we work like this and add a line of documentation.

Disable recursion no matter what other config there is.

Does not work (yet). It groups to aggresively and should drop some
services that are not dropped.

Add (some what lame) test for the Groups in services.

See issue #163, we should internally resolve IP addresses if we can.
This needs one more test, where we resolve both v4 and v6 addresses.

Create a smaller Dockerfile that just copies the static binary
in the image. No need to ship the *entire* golang build infrastructure
in an image.

Added some docs on how to locally build.

Dockerfile updates

Using a busybox only is annoying because there isn't a good dig
equiv. Having access to packages, in this case openwrt, makes sense
because it makes live much easier.

Total size is 15.13 MB.

Base image of progrium/busybox

kill the TYPE0 hack, added extra parameters instead to AddressRecord
(there are quite a few there now). Also cleaned up the test output.
Only show the failing test's question and reply, makes debugging much
easier.

Add the final tests that return v4 and v6 for a name we have internally.

Internal resolve

Fix the tests and copy/"paste" the SRVrecords function to a MXRecords
function. Both these function should be refactored, see #164.

Does not work (yet). It groups to aggresively and should drop some
services that are not dropped.

Add (some what lame) test for the Groups in services.

Add MX record support.

Using two loops now, but first assess the group for the services,
then loop again to actually fetch these services.

Added extra test in `msg/`, but this also fixes a test in server.

More extensive tests with multiple SkyDNS services. Slightly
more logging in the stubzone department.

Stubzones tests

Actually look under ns.dns.<domain> as documented in the readme.
Change the code and the tests.

Actually look under ns.dns.<domain> as documented in the readme.
Change the code and the tests.

…meserver

Add -no-rec

Fixes issue #168
Duplicate CNAMEs like:

    a.ipaddr.skydns.test.   3600    IN  A   172.16.1.1
    b.ipaddr.skydns.test.   3600    IN  A   172.16.1.2
    mx.skydns.test. 3600    IN  CNAME   a.ipaddr.skydns.test.
    mx.skydns.test. 3600    IN  CNAME   b.ipaddr.skydns.test.

are not allowed in the DNS and should be suppressed. Right now we just
allow one in the non-round-robin case the latter one (b.ipaddr.. in
this case). If round-robin is enabled we just flip a coin on wether to
include the "new" CNAME are not. The A/AAAA record that is not
referenced is still included in the answer, but this should not case any
harm, and should be ignored by the client.

Suppress duplicate CNAMEs

A lot of DNS client implementation think that they know how DNS
names should look. For instance glibc thinkg bla.*.com is illegal,
this makes doing queries from the commandline `ping bla.*.com`
impossible.

This PR brings back the idea from SkyDNS1 that `any` is an alternative
syntax for `*`. So you can write `ping bla.any.com` and everybody is
happy.

Fixes #127

Make `any` equal to `*`

progium/busybox will soon be deprecated and they point to Alpine
Linux. Make the changes to our repo and document how to build
SkyDNS because Alpine Linux used musl libc instead of glibc.

Base docker image out of Alpine Linux

New docker image based on Alpine Linux and various small bugfixes.

Add prometheus suppport. Still need to litter the code with counter
increments and maybe add some tests.

I'm in favor of making prometheus the *only* metrics for SkyDNS, but
for now I'm leaving the Graphite support in, although I consider that
legacy. I also did not extend on the stats.Counter idea and I'm just
using the prometheus stuff directly.

Add Size and Capacty as helper function so we can export these as
metrics.