add target in case there is no host in target

[ajayspinny]

What does this pull request do?

The current grpc instrumentation expects host value with a port that may not always be true. In our project we use internal host with out a port value

target = kwargs.get("target") or args[0]
if ":" in target:
    host, port = target.split(":")
    try:
        port = int(port)
    except ValueError:
        port = None
else:
    host, port = None, None

This results in span showing None value and we are not able to track the external host value. All grpc hosts are clubbed together under https://None value

The proposal is to keep the target value as is in case there is no ':' in the host and keep the port as None

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