Bug#766162: qa.debian.org: Use 'env' instead of /usr/bin/python to make source more portable.

[sophiejjj <j@introo.me>]

Package: qa.debian.org
Severity: wishlist
User: qa.debian.org@packages.debian.org
Usertags: debsources

Hi.

Currently somefiles are hard-coded with /usr/bin/python. e.g.,
debiansources-run-app and the alike.

This makes the code less portable, and inhibiting the use of 
virtualenv.

If we use /usr/bin/env python, then we regain the free to use
whater python binary we want, and we can also freely add .pth file, etc.


-- System Information:
Debian Release: jessie/sid
  APT prefers trusty-updates
  APT policy: (500, 'trusty-updates'), (500, 'trusty-security'), (500, 'trusty'), (100, 'trusty-backports')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.13.0-37-generic (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8)
Shell: /bin/sh linked to /bin/dash