Cleanup of mcservers code:    * Rename app_mc.js to mcapi.js and changed variable and command references.    * Update show_env to:         * show mcstored startup command         * show mcapi.js startup command         * show Elasticsearch (docker container) startup command         * show missing environment variables:               * MC_API_SERVICE_PORT               * MCDB_CONNECTION               * MC_ES_URL          * Removed reference to unused env variable MCFS_PORT          * Inform the user that they need to start Elasticsearch themselves and it needs to be done before running mcservers start
Cleanup of mcservers code:
   * Rename app_mc.js to mcapi.js and changed variable and command references.
   * Update show_env to:
        * show mcstored startup command
        * show mcapi.js startup command
        * show Elasticsearch (docker container) startup command
        * show missing environment variables:
              * MC_API_SERVICE_PORT
              * MCDB_CONNECTION
              * MC_ES_URL
         * Removed reference to unused env variable MCFS_PORT
         * Inform the user that they need to start Elasticsearch themselves and it needs to be done before running mcservers start

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