[TBD-1105] tSqoopExport_2 can't automatically stop

Driver issue when connection is sequentially used several times. No solution found yet.
Workaround consists in running them in independent sub-jobs via tRunJob
[TBD-1213] - Cassandra losing column integrity in version 2.x

Cassandra 2.x when using datastax driver build column names differently from previous versions misleading Hector driver (it retrieves null column when using slice.getColumnByName() while it is ok when it is hector who inserted data)
For 5.6.1 it was chosen to reconstruct the column name the way Cassandra 2.x datastax builds it while waiting for integration of new datastax driver in next releases.
[TBD-1289] - require external jar when tCassandraOutput check "use an existing connection"
[TBD-1137] return a more clear error message when there may be inconsistency between selected database version and actual database version
Merge branch 'maintenance/5.6' of https://github.com/Talend/tbd-studio-se into maintenance/5.6
Merge branch 'maintenance/5.6'