Revert "Fixed the assert messages."

This reverts commit bfe5fb83.

src/zc/buildout/networkcache.txt

@@ -10,11 +10,7 @@ Pure buildout ignore networkcache:
    ... networkcache-section = networkcache
    ... ''')
    >>> print system(buildout)
-   While:
-     Initializing.
-     Getting section networkcache.
-   Error: The referenced section, 'networkcache', was not defined.
-   <BLANKLINE>
+   Unused options for buildout: 'networkcache-section'.
 
 So lets activate networkcache in buildout:
    >>> write(sample_buildout, 'buildout.cfg',
@@ -226,13 +222,13 @@ In case if download cache is failing, original resources are used:
    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: <urlopen error [Errno 111] Connection refused>
+   Failed to download from network cache demo-0.4c1-py2.7.egg: [Errno 111] Connection refused
    Uploading http://localhost/demo-0.4c1-py2.7.egg into network cache.
    Fail to upload file. [Errno 111] Connection refused
    Got demo 0.4c1.
    Getting distribution for 'demoneeded'.
    Downloading demoneeded-1.2c1.zip from network cache.
-   Failed to download from network cache demoneeded-1.2c1.zip: <urlopen error [Errno 111] Connection refused>
+   Failed to download from network cache demoneeded-1.2c1.zip: [Errno 111] Connection refused
    Uploading http://localhost/demoneeded-1.2c1.zip into network cache.
    Fail to upload file. [Errno 111] Connection refused
    Got demoneeded 1.2c1.