Rescue expectation error when setting up requirements

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>

lib/bat/requirements.rb

@@ -104,7 +104,7 @@ def require_deployment(what, deployment_spec, options)
         expect(@bosh_runner.bosh_safe("deployment #{what.to_path}")).to succeed
         expect(@bosh_runner.bosh_safe('deploy')).to succeed
       end
-    rescue
+    rescue RSpec::Expectations::ExpectationNotMetError
       @spec_state.register_fail
       raise
     end