Add common_test.go to single test instructions
Add e2e/test/common_test.go to the single integration test
instructions.  Without it the documented process fails.
@@ -66,7 +66,7 @@ switch is optional.
You can run a single file of integration tests using the go test command:
```
-GOPATH=~/go go test -v test/e2e/libpod_suite_test.go test/e2e/config.go test/e2e/config_amd64.go test/e2e/your_test.go
+GOPATH=~/go go test -v test/e2e/libpod_suite_test.go test/e2e/common_test.go test/e2e/config.go test/e2e/config_amd64.go test/e2e/your_test.go
```
#### Run all tests like PAPR
