Revert "Temp fix for Spring nonsense. Replace interface with implementation"

This reverts commit 65b375ed9ca8e8fc20a938d35cfa8dff5423b9a2.
Revert "Angshu, Vinay | #1668 | Use JdbcConnectionProvider for omods from openmrs-atomfeed module"

This reverts commit c180c4a3a6ffaf0deb8cf4b65671d5ac0774ca36.