use environmental variables for ansible ssh configuration

quickstart does not set the ansible ssh configuration by default.
This change sets ANSIBLE_SSH_ARGS if it's not already set.

Change-Id: I61d8499fe16eb102a285972d347cef5acdbc71e8

ansible_ssh_env.sh

@@ -0,0 +1,5 @@
+: ${OPT_WORKDIR:=$HOME/.quickstart}
+
+#ssh config
+: ${SSH_CONFIG=$OPT_WORKDIR/ssh.config.ansible}
+: ${ANSIBLE_SSH_ARGS="-F ${SSH_CONFIG}"}

quickstart.sh

@@ -304,6 +304,9 @@ set -ex
 export ANSIBLE_CONFIG=$OOOQ_DIR/ansible.cfg
 export ANSIBLE_INVENTORY=$OPT_WORKDIR/hosts
 
+#set the ansible ssh.config options if not already set.
+source $OOOQ_DIR/ansible_ssh_env.sh
+
 if [ "$OPT_RETAIN_INVENTORY_FILE" = 0 ]; then
     # Clear out inventory file to avoid tripping over data
     # from a previous invocation