Start to hard depend on slapos.libnetworkcache.

Doing development without local slapos.libnetworkcache has no sense.

networkcached.cfg

+# In order to use this profile it is required to either clone in zc.buildout
+# directory slapos.libnetworkcache or fix develop target.
 [buildout]
 extends = buildout.cfg
 
 parts += nc pync testnc
+develop += slapos.libnetworkcache
 
 [nc]
 recipe = z3c.recipe.scripts