metastore api change
impl the thrift if
HiveParser.g change for desc role
ddl work and tasks and v2 auth calls
thrift gen files
updating HMSHandler
metastore client changes, sql std auth using it
show role principals
Revert "HiveParser.g change for desc role"

This reverts commit f82b910191312d2d1e7eb77ec12773d9b19d3175.
switching from describe role to show roles principal
set role asspcoated with  correctoperation
+ve test
updating error msg for v1
-ve tests