`sudo ./letsencrypt.py` cannot access data installed by `setup.py install --user` in Debian

[certbot]

`sudo ./letsencrypt.py` cannot access data installed by `setup.py install --user` in Debian

[kuba]

Seems like it is actually a security bug in Ubuntu:

$ sudo python -c 'import sys; print sys.path'
['', '/home/jakub/.local/lib/python2.7/site-packages/letsencrypt-0.1-py2.7.egg', '/home/jakub/.local/lib/python2.7/site-packages/python2_pythondialog-3.0.1-py2.7.egg', '/home/jakub/.local/lib/python2.7/site-packages/pycrypto-2.6.1-py2.7-linux-x86_64.egg', '/home/jakub/.local/lib/python2.7/site-packages/M2Crypto-0.22.3-py2.7-linux-x86_64.egg', '/home/jakub/.local/lib/python2.7/site-packages/jsonschema-2.4.0-py2.7.egg', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-x86_64-linux-gnu', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/home/jakub/.local/lib/python2.7/site-packages', '/usr/local/lib/python2.7/dist-packages']
$ HOME=foo sudo python -c 'import sys; print sys.path'
['', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-x86_64-linux-gnu', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages']
$ HOME=foo sudo python -c 'import os; print os.environ["HOME"]'
foo
$ sudo grep env_reset /etc/sudoers
Defaults        env_reset

while man sudo says:

ENVIRONMENT
     sudo utilizes the following environment variables.  The security policy has control over the actual content of the command's environment.

...
     HOME             Set to the home directory of the target user if -i or -H are specified, env_reset or always_set_home are set in sudoers, or when the -s option is specified and set_home is
                      set in sudoers.

[kuba]

Fixed in #48.