IBX-7769 Added safety check to ibexa:install command when tables in database exists #1626

Job	Run time
Run code style check (8.0)	2m 34s
Unit tests & SQLite integration tests (7.4)	6m 23s
Unit tests & SQLite integration tests (8.0)	6m 39s
Unit tests & SQLite integration tests (8.1)	6m 39s
Solr integration tests (7.4)	9m 36s
Solr integration tests (8.0)	9m 28s
Solr integration tests (8.1)	9m 33s
PostgreSQL integration tests (7.4)	20m 41s
PostgreSQL integration tests (8.0)	25m 6s
MySQL integration tests (7.4)	12m 43s
PostgreSQL integration tests (8.1)	28m 19s
MySQL integration tests (8.0)	12m 22s
MySQL integration tests (8.1)	12m 20s
	2h 42m 23s

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