Allow building whole Perun with production profile

- Since Maven doesn't respect selected profile in submodules,
  production build can be enforced using "-Dproduction" now.

  Doesn't work: mvn clean install -Pproduction

  Work now: mvn clean install -Dproduction

  ----------------------

  When you specify module to build or trigger build in module folder, then
  you can use "-Pproduction" as always.

  Work: mvn clean install -pl perun-rpc -am -Pproduction

  or in perun-rpc/ folder: mvn clean install -Pproduction