Description of problem:
Connection to VDB remains valid after VDB is undeployed.

How reproducible:
Connection con = TeiidDriver.getInstance().connect("jdbc:teiid:myvdb@mm://localhost:31000;user=user;password=password", new Properties());
System.out.println(con.isValid(1));
// undeploy VDB
System.out.println(con.isValid(1));


Actual results:
true
true

Expected results:
true
false