ecn-robots: added usr_add and usr_delete to pgbd.py

pgdb.py

@@ -116,6 +116,16 @@ class Db(object):
         sql = "SELECT rolname FROM pg_authid WHERE rolcanlogin=true;"
 	usrl = self._runsql(sql)
 	return usrl
+
+    def usr_add(self, us, passw):
+        sql = "CREATE ROLE "+self.sanitize(us)+" WITH NOSUPERUSER NOCREATEDB NOCREATEROLE NOCREATEUSER LOGIN PASSWORD '"+self.sanitize(passw)+"';"
+	usra = self._runsql(sql)
+        return usra
+
+    def usr_delete(self, us):
+        sql = "DROP ROLE IF EXISTS "+self.sanitize(us)+";"
+	usrd = self._runsql(sql)
+        return usrd
     
     def sanitize(self,s):
         mset = '0123456789ABCDEFGHIJKLMNOPRSTUVXYZabcdefghijklmnoprstuvxyz-_.'