Flake: TestDockerDriver_Run

[carolynvs]

Sometimes I will see this test fail in CI where it appears to capture the output of the driver twice. Repeating the test fixes it.

docker_integration_test.go:102: 
        	Error Trace:	docker_integration_test.go:102
        	            				docker_integration_test.go:44
        	Error:      	Not equal: 
        	            	expected: "Install action\n\nListing inputs\ninput1\n\nGenerating outputs\nAction install complete for example\n"
        	            	actual  : "Install action\n\nListing inputs\ninput1\n\nGenerating outputs\nAction install complete for example\nInstall action\n\nListing inputs\ninput1\n\nGenerating outputs\nAction install complete for example\n"
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -1 +1,8 @@
        	            	+Install action
        	            	+
        	            	+Listing inputs
        	            	+input1
        	            	+
        	            	+Generating outputs
        	            	+Action install complete for example
        	            	 Install action
        	Test:       	TestDockerDriver_Run
--- FAIL: TestDockerDriver_Run (4.29s)