* open babel socket in its own event loop, allowing to monitor instead of dump
* keep state from monitor in json object, providing that to clients on
network on demand
* do not parse babel routes, instead use netlink to obtain nexthop
babeld still does not support limiting the data on the socket by object. When
that is merged, the load can be further reduced by limiting to neighbour
changes with a small change.
In addition this PR contains:
- split of gluon-respondd provider into multiple source files
- minor additional cleanups in gluon-mesh-babel respondd provider
(untested, as the babel respondd provider already doesn't compile prior
to these changes...)
Rename to respondd.c / respondd.so, gluon.mk expects these names. This way
we can remove the install code. The installed filename is changed to
gluon-mesh-babel.so, bringing it in line with out common naming scheme.
