fix workitem TDI-29854 : support log4j for these left DB components
https://jira.talendforge.org/browse/TDI-29854
TDI-30681 fix bug: TUJ regression on 5.6 on Bug_TDI_24212_tELTJDBCXXX
https://jira.talendforge.org/browse/TDI-30681

Alias name _String is not allowed in the Oracle database select query;
before the ELT feature(TDI-29674), there is no alias name for the select
query, and no deliver table too.
So I change the logic, only add the alias name for the deliver table,
means the alias name will not effect the older jobs(because no deliver
table) before this feature any more.
Merge branch 'maintenance/5.6'