Adding Gropus to GlobalRoles using WLST

WLST script 

connect('weblogic','weblogic1','t3://192.168.195.129:8001') 
serverConfig()
cd('/SecurityConfiguration/pocdomain/Realms/myrealm/RoleMappers/XACMLRoleMapper')
cmo.setRoleExpression(",'Admin','Grp(EnvAdmins)|Grp(Administrators)')