Update virtualenv: BIGTOP-1635

Hi,

See also https://issues.apache.org/jira/browse/BIGTOP-1635

hue needs a symlink
sudo ln s /usr/lib/python2.7/plat*/_sysconfigdata_nd.py /usr/lib/python2.7/

on Debian8 and Ubuntu14.

This is the result of an obsolete virtualenv environment with tools/virtual-bootstrap.

I regenerated virtual-bootstrap from current virtualenv (1), removed the fix_local_scheme section (2), fixed a script in app.reg(3), and removed ctypes (4).

(1) Download virtualenv, run virtualenv.create_bootstrap_script("") write contents to file

(2) The call fix_local_scheme(home_dir, symlink) creates an "local" directory with symlinks to "lib". This breaks tools/relocate.sh since every python mode can be reached by local/lib/ and lib/. This creates an additional bogus relative ../ path section in the easy_setup.pth file. AFAIK this "local" dir is not needed here

(3) This script should activate build/env/bin/python. Ensuring it by prepending it into the PATH for subprocesses.

(4) ctypes in hue is 1.0.2 . ctypes is bundled with recent pythons and conflicts with the one supplied by hue. bundled by Centos6, Debian8 and Ubuntu14 is 1.1.0. I vote for removing it, since older python/distributions are not target of BIGTOP and may not be target of upstream Hue as well.

Since the diff contains binary files I will issue a pull request from github.