Updated openstack/openstack
Project: openstack-dev/devstack  ba5a8198d2116486cf9f94e798827f127d43d5a6
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Use heat's default value for max_template_size

Instead of aligning value with tempest, make tempest use heat's default
value as that is what most people will be deploying with.

Change-Id: I77549f2b5e953ff712c50a2b372f6b04725d5eb0