Implement getLogicalInfrastructureSuggestion in basic template.

Suggestion is based on a properties file.
Template methods building logical infrastructure in buildModel have been refactored in order to reuse the code.
Some temporary methods have been created for maintaining current buildModel functionality (marked with a FIXME)

getLogicalInfrastructureSuggestion returns a VCPENetworkModel with a complete model (physical and logical infrastructure with VRRP and BGP).

Related to issue: http://jira.i2cat.net:8080/browse/OPENNAAS-830