Avoid testnc.

Thanks to 4784a35e, which does buildout
"patching" procedure in test it is not required to provide testnc.

networkcached.cfg

 [buildout]
 extends = buildout.cfg
 
-parts += nc pync testnc
+parts += nc pync
 
 [nc]
 recipe = z3c.recipe.scripts
@@ -16,9 +16,3 @@ recipe = z3c.recipe.scripts
 eggs = slapos.libnetworkcache
 interpreter = pync
 executable = ${buildout:bin-directory}/pync
-
-[testnc]
-recipe = ${test:recipe}
-eggs = ${test:eggs}
-  slapos.libnetworkcache
-python = pync