Switch ZK example from string to list
Switch ZK example from string to list

`kazoo` 2.4 merged https://github.com/python-zk/kazoo/pull/424 which means `kazoo` now supports a list of multiple endpoints, not just a single string.

So updating the example conf file as a list is more readable than a string, and for most configuration options will require less munging of inputs.
s-maj/integrations-core,s-maj/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,itsuugo/integrations-core,StackVista/sts-agent-integrations-core,DataDog/integrations-core,itsuugo/integrations-core,varlib1/servermall,StackVista/sts-agent-integrations-core,StackVista/sts-agent-integrations-core,varlib1/servermall,serverdensity/sd-agent-core-plugins,DataDog/integrations-core,DataDog/integrations-core,itsuugo/integrations-core,DataDog/integrations-core,varlib1/servermall,itsuugo/integrations-core,DataDog/integrations-core,itsuugo/integrations-core,varlib1/servermall,s-maj/integrations-core,s-maj/integrations-core,varlib1/servermall,serverdensity/sd-agent-core-plugins,StackVista/sts-agent-integrations-core,StackVista/sts-agent-integrations-core,s-maj/integrations-core,serverdensity/sd-agent-core-plugins,serverdensity/sd-agent-core-plugins,serverdensity/sd-agent-core-plugins,DataDog/integrations-core