Reduce timeout for heat functional job

Right now the timeout for the head functional job is 120/125 min.
This was raised from 65 minutes in this patch:
https://review.openstack.org/#/c/154325/2

The length of time for this test (which wasn't finishing in 120
minutes anyway) has dropped since this patch has merged:
https://review.openstack.org/#/c/166030/1

Tests are finishing in just over 60 minutes:
https://review.openstack.org/#/c/154977/
https://review.openstack.org/#/c/166088/
https://review.openstack.org/#/c/165712/

Ideally we would like the functional job to finish within 60
minutes and for the timeout to reflect that, but starting with
70 minutes in this patch.

Change-Id: Id0ff8b086e4fa44a25bae49395c7aa23b24415da

jenkins/jobs/heat.yaml

@@ -58,7 +58,7 @@
 
     wrappers:
       - build-timeout:
-          timeout: 125
+          timeout: 75
       - timestamps
 
     builders:
@@ -69,7 +69,7 @@
           #!/bin/bash -xe
           export PYTHONUNBUFFERED=true
           export OVERRIDE_ENABLED_SERVICES=c-api,c-bak,c-sch,c-vol,cinder,dstat,g-api,g-reg,h-api,h-api-cfn,h-api-cw,h-eng,heat,key,mysql,n-api,n-cond,n-cpu,n-crt,n-obj,n-sch,q-agt,q-dhcp,q-l3,q-meta,q-metering,q-svc,q-vpn,quantum,rabbit,s-account,s-container,s-object,s-proxy,q-lbaas
-          export DEVSTACK_GATE_TIMEOUT=120
+          export DEVSTACK_GATE_TIMEOUT=70
           export DEVSTACK_GATE_NEUTRON=1
           export DEVSTACK_GATE_TEMPEST=0
           export DEVSTACK_GATE_EXERCISES=0