7.4 release needs to be compatible with Teiid 7.4 client.

So we need to add a new driver definition to the org.teiid.datatools.connectivity plugin.xml and any additional artifacts or definitions. Result should be that 7.4 Designer Preview Data and Execute VDB actions create/use a 7.4 Driver definition BUT the option in DTP to create a 7.1 Teiid driver is available.