TDI-30650:Enable log4j feature in the studio.
TDI-28637: Log4j for tXXXDBInput
https://jira.talendforge.org/browse/TDI-28637
remove duplicated log4j on all db input components
tAS400Input/tAccessInput/tAmazonMysqlInput/tAmazonOracleInput/tDB2Input/tDBInput/tEXAInput/tFirebirdInput/tGreenplumInput/tHSQLDbInput/tInformixInput/tIngresInput/tInterbaseInput/tJDBCInput/tJavaDBInput/tMSSqlInput/tMaxDBInput/tMysqlInput/tNetezzaInput/tOracleInput/tParAccelInput/tPostgresPlusInput/tPostgresqlInput/tRedshiftInput/tSQLiteInput/tSasInput/tSybaseInput/tVectorWiseInput/tVerticaInput
Merge branch 'maintenance/5.6'