Resolve symlinks when copying undercloud.conf to container.

If undercloud.conf is a symlink, the mistral-executor
container crashes. This change adds "local_follow: true",
which fixes the problem.

Closes-Bug: #1833635
Change-Id: Iffb232212e0a952538f95f54ccd55b68737e99e1
Signed-off-by: Mihai Plasoianu <m.plasoianu@vertical.de>

deployment/mistral/mistral-executor-container-puppet.yaml

@@ -205,6 +205,7 @@ outputs:
             dest: /var/lib/mistral/undercloud.conf
             mode: 0444
             setype: svirt_sandbox_file_t
+            local_follow: true
         - name: mistral logs readme
           copy:
             dest: /var/log/mistral/readme.txt