Add Apache Kafka (#20)

net/kafka/Bastillefile

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+CMD /bin/sh -c "echo '127.0.0.1 $(hostname)' >> /etc/hosts"
+
+PKG kafka zookeeper
+
+SYSRC zookeeper_enable=YES
+SYSRC kafka_enable=YES
+
+SERVICE zookeeper start
+SERVICE kafka start

net/kafka/README.md

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+## kafka
+Bastille template to boostrap kafka
+
+## Usage
+```shell
+bastille template TARGET net/kafka
+```