Refactored provider specific code out of server_context.cpp

include/wsrep/server_context.hpp

@@ -173,6 +173,12 @@ namespace wsrep
          */
         const std::string& address() const { return address_; }
 
+        /*!
+         * Return working directory
+         *
+         * \return String containing path to working directory.
+         */
+        const std::string& working_dir() const { return working_dir_; }
         /*!
          * Get the rollback mode which server is operating in.
          *