Merge pull request #408 from rmansoor/5.1-LEGACY

[PDI-10781] - Create/update agile mart datasource from properties files
[BISERVER-11331] If user is given the Manage Data Sources role, they do not see the same Manage Data Sources window as the admin user does.
Merge pull request #409 from brendan-lynch/5.1-legacy-biserver11331

[BISERVER-11331] If user is given the Manage Data Sources role, they do ...
[PDI-11993] - Display Agile Mart connection type - working display of AgileMart connection type. Added attribute to indicate "standard" connection type. Added filtering standard connections when creating new mondrian or dsw data
Merge pull request #410 from pminutillo/5.1-LEGACY

[PDI-11993] - Display Agile Mart connection type - working display of Ag...
BISERVER-11142 - Staging table not getting deleted when a datasource created using CSV File of Data Source Wizard is deleted

What was done:
1) fixed code for deserializing model
2) fixed method for deleting CSVs
3) adde call to te method deleting CSVs
Merge pull request #411 from kolinus/BISERVER-11142

BISERVER-11142 - Staging table not getting deleted when a datasource cre...
[BISERVER-11241] - Using the import handler in the importer package instead of importexport