add loggregator syslog drain smoke test

[#76474472]

Signed-off-by: Johannes Petzold <jpetzold@pivotal.io>
make syslog smoke tests more robust

- always create an app for the test
- return exit code 2 if BeforeEach fails

[#76474472]

Signed-off-by: Trevor Ackerman <tackerman@pivotal.io>
wait for syslog test listener to come up

[#76474472]

Signed-off-by: Johannes Petzold <jpetzold@pivotal.io>