NLSR

Currently, the constructors for the LSA implementations take a string for the LS type as a constructor parameter.

Instead, this parameter should be removed from their constructor and should be passed when initializing the base class.

• This task should remove the Lsa::setLsType() method, as there is no reason to change the LSA type after construction.
• The member variable Lsa.m_lsType should be const as it should not be changed after construction.
• The Lsa::Lsa() constructor should take an LSA type as a parameter and assign it to m_lsType.
• All derived classes should pass their TYPE_STRING to the LSA constructor in their initialization list
• Constructors for derived classes should not take the LSA type as a parameter. The LSA type for an LSA is a strict value and should not be modifiable by the API.