pulsar.Client() needs option to supress STDOUT

**Is your feature request related to a problem? Please describe.**
This isn't necessarily a problem, but requires a workaround

**Describe the solution you'd like**
Simply add
client = pulsar.Client(ip, stdout=False)

**Describe alternatives you've considered**
Otherwise I have to manually supress stdout when I call pulsar.Client() or producer.send()

**Additional context**
Add any other context or screenshots about the feature request here.

Start at the pulsar.Client() and producer.send() entry points mentioned in the issue, and trace where they write to STDOUT. Check the existing client and producer tests for the relevant behavior. Done means callers can pass stdout=False to suppress output from these operations, with tests covering the option.

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