Merge "Add git installation to docker guide"

diff --cc docs/release/userguide/docker.userguide.rst
index 6064de2,d9e6747..cc9dd04
--- 1/docs/release/userguide/docker.userguide.rst
--- 2/docs/release/userguide/docker.userguide.rst
+++ b/docs/release/userguide/docker.userguide.rst
@@@ -181,13 -181,8 +181,14 @@@ To install Ansible 2.6.3 on Centos
      $ sudo yum install epel-release
      $ sudo yum install python-pip
      $ sudo -H pip install 'ansible==2.6.3'
+     $ sudo yum install git
  
 +.. note::
 +   When using multi-node-setup, please make sure that 'python' package is
 +   installed on all of the target nodes (ansible during 'Gathering facts'
 +   phase is using python2 and it may not be installed by default on some
 +   distributions - e.g. on Ubuntu 16.04 it has to be installed manually)
 +
  Clone barometer repo
  ^^^^^^^^^^^^^^^^^^^^