NONRTRIC - Implement DMaaP mediator producer service in Java

Implement DMaaP mediator producer service in Java.

Signed-off-by: PatrikBuhr <patrik.buhr@est.tech>
Issue-ID: NONRTRIC-597
Change-Id: I9927b3d25094b47484c9fcc60950b7b64c2a4006
diff --git a/dmaap-adaptor-java/config/README b/dmaap-adaptor-java/config/README
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+The keystore.jks and truststore.jks files are created by using the following commands (note that this is an example):
+
+1) Create a CA certificate and a private key:
+
+openssl genrsa -des3 -out CA-key.pem 2048
+openssl req -new -key CA-key.pem -x509 -days 1000 -out CA-cert.pem
+
+2) Create a keystore with a private key entry that is signed by the CA:
+
+keytool -genkeypair -alias policy_agent -keyalg RSA -keysize 2048 -keystore keystore.jks -validity 3650 -storepass policy_agent
+keytool -certreq -alias policy_agent -file request.csr -keystore keystore.jks -ext san=dns:your.domain.com -storepass policy_agent
+openssl x509 -req -days 365 -in request.csr -CA CA-cert.pem -CAkey CA-key.pem -CAcreateserial -out ca_signed-cert.pem
+keytool -importcert -alias ca_cert -file CA-cert.pem -keystore keystore.jks -trustcacerts -storepass policy_agent
+keytool -importcert -alias policy_agent -file ca_signed-cert.pem -keystore keystore.jks -trustcacerts -storepass policy_agent
+
+
+3) Create a trust store containing the CA cert (to trust all certs signed by the CA):
+
+keytool -genkeypair -alias not_used -keyalg RSA -keysize 2048 -keystore truststore.jks -validity 3650 -storepass policy_agent
+keytool -importcert -alias ca_cert -file CA-cert.pem -keystore truststore.jks -trustcacerts -storepass policy_agent
+
+
+4) Command for listing of the contents of jks files, examples:
+keytool -list -v -keystore keystore.jks -storepass policy_agent
+keytool -list -v -keystore truststore.jks -storepass policy_agent
+
+## License
+
+Copyright (C) 2020 Nordix Foundation. All rights reserved.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+