[overcloud] create a stable symlink to the templates dir
[overcloud] create a stable symlink to the templates dir

The templates directory is computed dynamically.
A stable symlink can be used to always find them without using
yet another parameter.

There are several users of the template directory, and probably
most (or all) of them could potentially benefit from using
this fixed name.
For example, log collection can easily refer to this symlink
instead relying on a parameter to find it.

Change-Id: Iff599d05c80aa57c66bee60f39fc1db4899b7b3b

redhat-openstack/infrared,redhat-openstack/infrared,redhat-openstack/infrared