Install ansible from git source

Bumps the SHA just past the 2.2.1.0 release to include a fix for
rendering vars to yaml which breaks OSA.

This can be reverted once the next stable release is tagged.

https://github.com/ansible/ansible/commits/stable-2.2
ansible/ansible#20253

Change-Id: I62aaba7d8010415e1953b95ce294ba76400a1b97

scripts/bootstrap-ansible.sh

@@ -22,7 +22,7 @@ set -e -u -x
 ## Vars ----------------------------------------------------------------------
 export HTTP_PROXY=${HTTP_PROXY:-""}
 export HTTPS_PROXY=${HTTPS_PROXY:-""}
-export ANSIBLE_PACKAGE=${ANSIBLE_PACKAGE:-"ansible==2.2.1.0"}
+export ANSIBLE_PACKAGE=${ANSIBLE_PACKAGE:-"git+https://github.com/ansible/ansible@e85f3f44610fa454c80da6b0f5ae84e3887a6955"} # stable-2.2 post 2.2.1.0 with yaml fix
 export ANSIBLE_ROLE_FILE=${ANSIBLE_ROLE_FILE:-"ansible-role-requirements.yml"}
 export SSH_DIR=${SSH_DIR:-"/root/.ssh"}
 export DEBIAN_FRONTEND=${DEBIAN_FRONTEND:-"noninteractive"}