Include CheckResult#scheduling_source in state and history

[Al2Klimov]

fixes #160

[Al2Klimov]

Blocked by

• Make CheckResult#scheduling_source available to Icinga DB icinga2#9010

[Al2Klimov]

MariaDB [idb]> select scheduling_source from host_state;
+------------------------------+
| scheduling_source            |
+------------------------------+
| Alexanders-MacBook-Pro.local |
+------------------------------+
1 row in set (0.005 sec)

MariaDB [idb]> select scheduling_source from service_state;
+------------------------------+
| scheduling_source            |
+------------------------------+
| Alexanders-MacBook-Pro.local |
| Alexanders-MacBook-Pro.local |
| Alexanders-MacBook-Pro.local |
| Alexanders-MacBook-Pro.local |
| Alexanders-MacBook-Pro.local |
| Alexanders-MacBook-Pro.local |
| Alexanders-MacBook-Pro.local |
| Alexanders-MacBook-Pro.local |
| Alexanders-MacBook-Pro.local |
| Alexanders-MacBook-Pro.local |
| Alexanders-MacBook-Pro.local |
+------------------------------+
11 rows in set (0.008 sec)

MariaDB [idb]> select count(*), scheduling_source from state_history group by scheduling_source;
+----------+------------------------------+
| count(*) | scheduling_source            |
+----------+------------------------------+
|       11 | NULL                         |
|       28 | Alexanders-MacBook-Pro.local |
+----------+------------------------------+
2 rows in set (0.008 sec)

MariaDB [idb]>