Add bigip versioning when specified
Add bigip versioning when specified

Problem:
- The bigip_ver token is accepted but not used by the Makefile

Solution:
- add a function conditional and call function that generates correct named bigip when needed

michaeldayreads/marathon-bigip-ctlr,michaeldayreads/marathon-bigip-ctlr,michaeldayreads/marathon-bigip-ctlr