SOSHibernateOpenSessionException should extend SOSHibernateInvalidSessionException

Current Situation

• SOSHibernateOpenSessionException can occurs by SOS Hibernate openSession methods if session/connection can't be acquired ( c3p0 is not configured) and is extends SOSHibernateException
• all another SOS Hibernate methods throw SOSHibernateInvalidSessionException if session/connection can't be acquired
• to check if session/connection can't be acquired , the both exception types should be catched(SOSHibernateOpenSessionException, SOSHibernateInvalidSessionException)

Desired Behavior
SOSHibernateOpenSessionException should be extends of SOSHibernateInvalidSessionException