CORE-1858: Changed queries to use USER_* tables instead ALL_* avoiding slowly performance when join tables.

Hi Nathan,

I've made some adjustments to increase the performance of liquibase in our environment. As our database has a large amount of data and users, the select in ALL_* tables was taking about 6 to 8 hours. I've changed
The queries to use the USER_* tables instead of ALL_* tables. The execution time went from 8 hours to less than an hour. 

Best regards
John