*: split & distribute memtypes and stop (re|ab)using lib/ MTYPEs

*: split & distribute memtypes and stop (re|ab)using lib/ MTYPEs

This is a rather large mechanical commit that splits up the memory types
defined in lib/memtypes.c and distributes them into *_memory.[ch] files
in the individual daemons.

The zebra change is slightly annoying because there is no nice place to
put the #include "zebra_memory.h" statement.

bgpd, ospf6d, isisd and some tests were reusing MTYPEs defined in the
library for its own use.  This is bad practice and would break when the
memtype are made static.

Acked-by: Vincent JARDIN <vincent.jardin@6wind.com>
Acked-by: Donald Sharp <sharpd@cumulusnetworks.com>
[CF: rebased for cmaster-next]
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
Signed-off-by: Christian Franke <chris@opensourcerouting.org>