Make ; at end of line in .conf file optional

[troglobit]

Currently the pim6sd .conf file parser requires a ; even though most settings end with a newline. To make editing the .conf a bit more "Made Easy" it would be preferable if the parser could also accept newline as a separator for configuration directives. Similar to mrouted, pimd, and smcroute. At least mrouted uses the same type of Yacc/Bison based parser (with the same ancestry).

This may seem like a complicated issue to start with, but the build system takes care of a lot of the problems with running yacc/bison and lex/flex. Most of the work is figuring out how the mrouted parser does it and porting that to pim6sd.