Azure plugins - instance and loadbalancer

[chungers]

This PR adds support for creating VM instances on Azure.

• Added package in pkg/provider/azure
• Added driver in pkg/run/v0/azure to associate with a new kind azure (for infrakit plugin start).
• Load the package in cmd/infrakit main.

TODO:

• Tests
• Support for basic resource types such as Disks and Subnets.

Signed-off-by: David Chung david.chung@docker.com

[GordonTheTurtle]

Please sign your commits following these rules:
https://github.com/moby/moby/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "azure-plugin" git@github.com:chungers/infrakit.git somewhere
$ cd somewhere
$ git rebase -i HEAD~842354187600
editor opens
change each 'pick' to 'edit'
save the file and quit
$ git commit --amend -s --no-edit
$ git rebase --continue # and repeat the amend for each commit
$ git push -f

Amending updates the existing PR. You DO NOT need to open a new one.

[codecov]

Codecov Report

Merging #709 into master will increase coverage by 16.46%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #709       +/-   ##
===========================================
+ Coverage   46.66%   63.12%   +16.46%     
===========================================
  Files          85        7       -78     
  Lines        9404      659     -8745     
===========================================
- Hits         4388      416     -3972     
+ Misses       4683      192     -4491     
+ Partials      333       51      -282

Impacted Files	Coverage Δ
pkg/template/defaults.go
pkg/provider/google/plugin/instance/util/name.go
pkg/provider/rackhd/plugin/instance/builder.go
pkg/types/error.go
pkg/provider/aws/plugin/instance/ec2_volume.go
pkg/types/path.go
pkg/types/reflect.go
pkg/types/object.go
pkg/provider/aws/plugin/instance/dynamodb_table.go
...der/aws/plugin/instance/cloudwatchlogs_loggroup.go
... and 68 more

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