vendor: update all dependencies except Azure SDK

The Azure SDK doesn't support Go 1.5 anymore. We can't upgrade it until
Go 1.8 comes out.

vendor/github.com/aristanetworks/goarista/.travis.yml

@@ -1,6 +1,6 @@
 language: go
 go:
-- 1.6.2
+- 1.7.3
 - tip
 before_install:
 - go get -v github.com/golang/lint/golint
@@ -13,3 +13,4 @@ script:
 notifications:
   slack:
     secure: 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
+    on_success: change

vendor/github.com/aristanetworks/goarista/Dockerfile

@@ -3,7 +3,7 @@
 # that can be found in the COPYING file.
 
 # TODO: move this to cmd/ockafka (https://github.com/docker/hub-feedback/issues/292)
-FROM golang:1.6
+FROM golang:1.7.3
 
 RUN mkdir -p /go/src/github.com/aristanetworks/goarista/cmd
 WORKDIR /go/src/github.com/aristanetworks/goarista