Bug#751555: respect http{,s}_proxy env variables

[Yaroslav Halchenko]

Package: maven-debian-helper
Version: 1.6.7
Severity: wishlist
File: /usr/bin/mvn

Those are respected by many environments/libraries/tools in Debian and
handy to force/block network access (e.g. to validate pkg building be
sufficient without network connection).  Maven has its own (XML) means
to configure proxy access and does not care about environment
variables.  I think it would be sensible to support it on on
Debian systems.

-- System Information:
Debian Release: jessie/sid
  APT prefers testing
  APT policy: (900, 'testing'), (600, 'unstable'), (300, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.14-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages maven-debian-helper depends on:
ii  default-jdk                     2:1.7-52
ii  libmaven-clean-plugin-java      2.5-1
ii  libmaven-compiler-plugin-java   2.5.1-1
ii  libmaven-jar-plugin-java        2.4-1
ii  libmaven-resources-plugin-java  2.3-8
ii  libmaven-site-plugin-java       2.1-2
ii  libplexus-velocity-java         1.1.8-1
ii  libsurefire-java                2.10-5
ii  maven-repo-helper               1.8.7
ii  maven2                          2.2.1-20
ii  velocity                        1.7-4

maven-debian-helper recommends no packages.

Versions of packages maven-debian-helper suggests:
ii  apt-file                      2.5.2
ii  devscripts                    2.14.2
pn  libmaven-javadoc-plugin-java  <none>
ii  subversion                    1.8.9-1

-- no debconf information