remove rebar, CouchDB builds its own rebar as part of the build process
diff --git a/ansible/roles/ubuntu-worker/tasks/main.yml b/ansible/roles/ubuntu-worker/tasks/main.yml
index beb153c..8754985 100644
--- a/ansible/roles/ubuntu-worker/tasks/main.yml
+++ b/ansible/roles/ubuntu-worker/tasks/main.yml
@@ -16,5 +16,4 @@
 #   under the License.
 
 - include: dependencies.yml
-- include: rebar.yml
 - include: couchdb.yml
diff --git a/ansible/roles/ubuntu-worker/tasks/rebar.yml b/ansible/roles/ubuntu-worker/tasks/rebar.yml
deleted file mode 100644
index b6108fb..0000000
--- a/ansible/roles/ubuntu-worker/tasks/rebar.yml
+++ /dev/null
@@ -1,54 +0,0 @@
-# Licensed to the Apache Software Foundation (ASF) under one
-# or more contributor license agreements.  See the NOTICE file
-# distributed with this work for additional information
-# regarding copyright ownership.  The ASF licenses this file
-# to you under the Apache License, Version 2.0 (the
-# "License"); you may not use this file except in compliance
-# with the License.  You may obtain a copy of the License at
-#
-#   http://www.apache.org/licenses/LICENSE-2.0
-#
-#   Unless required by applicable law or agreed to in writing,
-#   software distributed under the License is distributed on an
-#   "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-#   KIND, either express or implied.  See the License for the
-#   specific language governing permissions and limitations
-#   under the License.
-
-- name: create rebar group
-  group:
-    name: rebar
-    state: present
-
-- name: create rebar user
-  user:
-    name: rebar
-    createhome: yes
-    group: rebar
-    state: present
-
-- name: download rebar
-  get_url:
-    url: https://github.com/rebar/rebar/archive/{{ rebar_version }}.tar.gz
-    dest: /home/rebar/
-
-- name: unpack rebar
-  unarchive:
-    dest: /home/rebar
-    creates: /home/rebar/rebar-{{ rebar_version }}/bootstrap
-    group: rebar
-    owner: rebar
-    src: /home/rebar/rebar-{{ rebar_version }}.tar.gz
-
-- name: bootstrap rebar
-  command: ./bootstrap
-  args:
-    chdir: /home/rebar/rebar-{{ rebar_version }}
-    creates: /home/rebar/rebar-{{ rebar_version }}/rebar
-
-- name: copy rebar executable
-  command: cp /home/rebar/rebar-{{ rebar_version }}/rebar /usr/local/bin/
-  args:
-    creates: /usr/local/bin/rebar
-
-
diff --git a/ansible/roles/ubuntu-worker/vars/main.yml b/ansible/roles/ubuntu-worker/vars/main.yml
deleted file mode 100644
index 7d60c00..0000000
--- a/ansible/roles/ubuntu-worker/vars/main.yml
+++ /dev/null
@@ -1,18 +0,0 @@
-# Licensed to the Apache Software Foundation (ASF) under one
-# or more contributor license agreements.  See the NOTICE file
-# distributed with this work for additional information
-# regarding copyright ownership.  The ASF licenses this file
-# to you under the Apache License, Version 2.0 (the
-# "License"); you may not use this file except in compliance
-# with the License.  You may obtain a copy of the License at
-#
-#   http://www.apache.org/licenses/LICENSE-2.0
-#
-#   Unless required by applicable law or agreed to in writing,
-#   software distributed under the License is distributed on an
-#   "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-#   KIND, either express or implied.  See the License for the
-#   specific language governing permissions and limitations
-#   under the License.
-
-rebar_version: 2.6.1