Create a unified RunCommand function with Assert()

Remove some run functions and replace them with the unified run command.
Remove DockerCmdWithStdoutStderr
Remove many duplicate runCommand functions.
Also add dockerCmdWithResult()
Allow Result.Assert() to ignore the error message if an exit status is expected.
Fix race in DockerSuite.TestDockerInspectMultipleNetwork
Fix flaky test DockerSuite.TestRunInteractiveWithRestartPolicy

Signed-off-by: Daniel Nephin <dnephin@docker.com>
Upstream-commit: d7022f2b46589cb9d860219e1d8278351ba147c3
Component: engine

components/engine/integration-cli/docker_cli_exec_test.go

@@ -16,6 +16,7 @@ import (
 	"time"
 
 	"github.com/docker/docker/pkg/integration/checker"
+	icmd "github.com/docker/docker/pkg/integration/cmd"
 	"github.com/go-check/check"
 )
 
@@ -122,10 +123,8 @@ func (s *DockerSuite) TestExecEnv(c *check.C) {
 func (s *DockerSuite) TestExecExitStatus(c *check.C) {
 	runSleepingContainer(c, "-d", "--name", "top")
 
-	// Test normal (non-detached) case first
-	cmd := exec.Command(dockerBinary, "exec", "top", "sh", "-c", "exit 23")
-	ec, _ := runCommand(cmd)
-	c.Assert(ec, checker.Equals, 23)
+	result := icmd.RunCommand(dockerBinary, "exec", "top", "sh", "-c", "exit 23")
+	result.Assert(c, icmd.Expected{ExitCode: 23, Error: "exit status 23"})
 }
 
 func (s *DockerSuite) TestExecPausedContainer(c *check.C) {