Conflicting modules: radio, rpl, border_router

[CW-75]

When it's implemented in the code a functionality with border_router_add_ipv6_node() and radio_init_setup() (setting ipv6 address) is throwing a conflict if both functions are used, the radio initialization it's broken and the others configurations parameters are not set. If you retry using first radio_init_setup() you could find that border_router_add_ipv6_node() doesn't change the ipv6 address. This issue also affects in rpl initialization, if radio_init_setup() is not executed the anothers functonalities are affected.
Also Rpl initilization to dodag or dag should be manage only in the rpl module, in border_router_add_ipv6_node() is initializing the node as dodag. This means that if want to create a dag node, couldn't work, because is initialized as dodag...