JR43106: Implementation of BTET_MODE Environment variable,to make Teradata Plugin uses Transaction Semantics in mode: BTET

Teradata Plugin in Datastage works in ANSI mode where as Teradata SQL Assistant works in BTET mode. As of now only ANSI mode
is supported in Teradata Plugin. Teradata Plugin uses Transaction Semantics in mode: ANSI.
Teradata SQL Assistant uses Transaction Semantics in mode : BTET. 

RESOLUTION:
Implemented BTET_MODE Environment variable. Add environment variable BTET_MODE and set value to TRUE in Datastage Administrator. 
Note that this environment variable does not present default value and should be added in Datastage Administrator.