Removed  templates directory in api config

This patch removes the template_path config
option in the API config file.  The path currently
points to a non existing directory.

Since we are no longer supporting templates in ironic
then we can simply remove this option altogether

Change-Id: I94e8c2d8fec70175e294f9b67156f13cd11ee642
Merge "Removed  templates directory in api config"