Library became more verbose.

src/zc/buildout/networkcache.txt

@@ -82,7 +82,7 @@ But whenever networkcache configuration is enabled, it is possible to use it:
    Installing eggs.
    Getting distribution for 'demoneeded==1.2c1'.
    Downloading demoneeded-1.2c1.zip from network cache.
-   Failed to download from network cache demoneeded-1.2c1.zip: 
+   Failed to download from network cache demoneeded-1.2c1.zip: 404 : File not found
    Uploading http://localhost/demoneeded-1.2c1.zip into network cache.
    Got demoneeded 1.2c1.
    <BLANKLINE>
@@ -140,7 +140,7 @@ As one can see, in case if upload is not working, there is no problem with runni
    Installing eggs.
    Getting distribution for 'demo'.
    Downloading demo-0.4c1-py2.7.egg from network cache.
-   Failed to download from network cache demo-0.4c1-py2.7.egg: 
+   Failed to download from network cache demo-0.4c1-py2.7.egg: 404 : File not found
    Uploading http://localhost/demo-0.4c1-py2.7.egg into network cache.
    Fail to upload file. [Errno 111] Connection refused
    Got demo 0.4c1.
@@ -181,7 +181,7 @@ Upload is optional, and then no upload will be tried:
    Installing eggs.
    Getting distribution for 'demo'.
    Downloading demo-0.4c1-py2.7.egg from network cache.
-   Failed to download from network cache demo-0.4c1-py2.7.egg: 
+   Failed to download from network cache demo-0.4c1-py2.7.egg: 404 : File not found
    Got demo 0.4c1.
    Getting distribution for 'demoneeded'.
    Downloading demoneeded-1.2c1.zip from network cache.