removed ArmController that is no longer needed.

The function to create DataStoreZabbix instance is added in commit
c312cfda814a667b40cfc4704ecad756b8e81c6c.
It has ArmZabbixAPI instance as a member variable.

<< Tasks to do in the near future >>
- implements DataStoreZabbix::getTriggers().
- implements VirtualDataStoreZabbix::getTriggers().
- parse arguments of --data-store-zabbix and create multiple
  DataStoreZabbix instances.

<< Next milestone >>
showing a 'Overview' (that is mainly needs triggers data of the server)
of ZABBIX PHP UI. The assumed design of the data stream is the following.

[Zabbix Server] =>
  (A) ArmZabbAPI -> (B) DataStoreZabbix -> (C) VirtualDataStoreZabbix
    -> (D) SQLProcessorZabbix -> (D) FaceMySQLWorker  => ZABBIX PHP client

<< Next next milestone >>
Merge data from two zabbix servers at (C) VirtualDataStore: