Fix [H302] errors in heat/engine

Change-Id: Ib3e1a6f9d5e82e9fb29b000157b57dbc3883b42e
Fix [H302] errors in heat/tests

Change-Id: Ia7527c6704e61d854be8e847e2401f33fb48d4df
Fix [H302] errors in heat_integrationtests

Change-Id: I116e55685e1ee11a0c58c9b33c00cfc0e9f42efe
Merge "Fix [H302] errors in heat/engine"
Merge "Fix [H302] errors in heat/tests"
Merge "Fix [H302] errors in heat_integrationtests"