vzdump: fix hook script environment

Signed-off-by: Mark Casey <markc@unifiedgroup.com>

fix LWP dependencies

We always use a changelog file for each package (not source package).

There is a bug in LWP:UserAgent - it does not use CONNECT for https
proxy calls. So such calls fails with SQUID.

Passing value 0 mean unlimited.

Includes full german translation.

iSCSI naming is already confusing, so we use the original terms here.

For performance reasons.

Signed-off-by: Damien PIQUET <piqudam@gmail.com>

Nodes can have different apt sources, so changelog localtion can also differ.

Because 'apt-get dist-upgrade' also does not consider the package
selection state (as opposed to apt-get dselect-upgrade).

Because 'Update' only makes sense for users knowing apt-get
command line tool.

Work for some packages, but not for all security updates. Seems
Debian security team does not upload changelogs.