gluon-mesh-babel conigures babeld and thus the mesh. This mesh is only usable
with routes to the clients which are discovered by l3roamd.

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.