v6 uses log-cache
v6 uses log-cache

- make the v6 StreamingLogsStub more like the v7 one.

I also had to add a short delay after it writes out the logs because the
PollStart function will stop looking at the LogStream channels once all
the other channels are closed. This way we ensure the poller will find
the log channel contents before looking at the others.

[#170138644]

Authored-by: Eric Promislow <6c389fa4d719bbeec88fea52ca3b2497804923ad@suse.com>

cloudfoundry/cli,cloudfoundry/cli,cloudfoundry/cli