OBMFULL-6107 Faster device deletion
OBMFULL-6109 Refactored DatabaseConnectionProviderImplTest.

Conflicts:
	java/sync/dbcp/src/test/java/org/obm/dbcp/DatabaseConnectionProviderImplTest.java
OBMFULL-6109 DBCP.isReadOnlyTransaction() returns true if there's no transaction.

Conflicts:
	java/sync/annotations/src/main/java/org/obm/annotations/transactional/TransactionalBinder.java
	java/sync/annotations/src/test/java/org/obm/annotations/transactional/TransactionalBinderTest.java
	java/sync/dbcp/src/test/java/org/obm/dbcp/DatabaseConnectionProviderImplTest.java