Use go 1.8.1 for CI and Release builds (#2732)

CHANGELOG.md

@@ -79,6 +79,7 @@ be deprecated eventually.
 - [#2705](https://github.com/influxdata/telegraf/pull/2705): Kinesis output: add use_random_partitionkey option
 - [#2635](https://github.com/influxdata/telegraf/issues/2635): add tcp keep-alive to socket_listener & socket_writer
 - [#2031](https://github.com/influxdata/telegraf/pull/2031): Add Kapacitor input plugin
+- [#2732](https://github.com/influxdata/telegraf/pull/2732): Use go 1.8.1
 
 ### Bugfixes
 

circle.yml

@@ -1,13 +1,11 @@
 machine:
+  go:
+    version: 1.8.1
   services:
     - docker
-  post:
+    - memcached
-    - sudo service zookeeper stop
+    - redis
-    - go version
+    - rabbitmq-server
-    - sudo rm -rf /usr/local/go
-    - wget https://storage.googleapis.com/golang/go1.8.linux-amd64.tar.gz
-    - sudo tar -C /usr/local -xzf go1.8.linux-amd64.tar.gz
-    - go version
 
 dependencies:
   override: