Adds new parameter interpolations for tempest config
Adds new parameter interpolations for tempest config

Tempest recently added a number of new config variables
and this patch merely adds those variables to the
template replacement process in tools/configure_tempest.sh

This needs to go in before this:

https://review.openstack.org/#/c/8738/2

Additionally, this patch sets the build_interval to 3
and the build_timeout to 400. This faster status check
interval should allow Tempest to run a bit quicker in the
Jenkins gate job.

Change-Id: I8835ccdee6af58da66c6327ddae8a05b6789d454

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