RPC: Update tomcat version used in tomcat7 maven plugin
RPC: Update tomcat version used in tomcat7 maven plugin

- Use latest Tomcat version 7.0.85 as included in tomcat7 maven plugin,
  since 7.0.56 does have problems with tomcat8 servlet-api provided
  by new spring platform (compiled on java8).
- This affect only locally running tomcats started by developers
  using command: "mvn tomcat7:run-war".

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