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Bug 1613280 - only create netpolicy if one already exists (#173)

* Bug 1613280 - only create netpolicy if one already exists

If there are other services in the target namespace talking to each other with
no network policy, during APB deployments we automatically create one that
blocks the other services. This change looks to see if there are any network
policies on the target namespace. If there are none, we forgo creating the
network policy, assuming things are open and the transient namespace should be
able to talk to the target with no issues. If there are existing network
policies, then we will add ours to give the transient namespace access to the
target. There is still the chance that our network policy could still affect
things depending on the variety of existing network policies in place, too
many to verify.

* ensure at least one target is passed in

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