Make fixtures files template-able :)

So it can adapt to certain env (like tcp vs unix socket for docker suite)

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

integration/utils/traefikCmd.go

@@ -0,0 +1,16 @@
+package utils
+
+import (
+	"os/exec"
+)
+
+var execCommand = exec.Command
+
+// RunCommand runs the specified command with arguments and returns
+// the output and the error if any.
+func RunCommand(binary string, args ...string) (*exec.Cmd, string, error) {
+	cmd := execCommand(binary, args...)
+	out, err := cmd.CombinedOutput()
+	output := string(out)
+	return cmd, output, err
+}