Add test fail if self.compute is False

We do not need run tests with instance creation if
we have deployment without compute nodes

In this patch add self.fail in test SetUp
for murano and heat tests for case when
deployment without compute nodes

Change-Id: I0e6f9db020bb5a85c4729273d9d4d0fe8cc5e7f7
Closes-bug: #1288664
Merge "Add test fail if self.compute is False"