[Piuparts-reports] detect_network_issues

[piuparts master]

Network problems on detected!
(By grep'ing for
    'Cannot initiate the connection to',
    'Failed to fetch',
    'Some index files failed to download',
    'Hash Sum mismatch',
    'The following signatures were invalid'
in failed logs.)
Test failures due to modified /usr/share/doc/*/changelog.*
are caused by mirror updates during the test.

The following logfiles have been deleted:

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removed `/srv/piuparts.debian.org/master/lenny2squeeze/fail/libblkid-dev_2.17.2-9.log'