Eggs handling

This PR currently gives me:
```
[jinja2]    u'PYTHON_SITE_PACKAGES_REL': u'lib/python2.7/site-packages',
[jinja2]    'ZLIB': '/auto/nest/nest/u/ondrej/repos/python-hpcmp2/opt/zlib/fevs',
[jinja2]    'ZLIB_ID': 'zlib/fevseg427lzhvz3uwc3khngcqeinsuaj'}
[jinja2] mv: cannot stat `/auto/nest/nest/u/ondrej/repos/python-hpcmp2/opt/jinja2/h6cyfecj/lib/python2.7/site-packages/*.egg/*': No such file or directory
[jinja2 ERROR] Command '['mv', u'/auto/nest/nest/u/ondrej/repos/python-hpcmp2/opt/jinja2/h6cyfecj/lib/python2.7/site-packages/*.egg/*', u'/auto/nest/nest/u/ondrej/repos/python-hpcmp2/opt/jinja2/h6cyfecj/lib/python2.7/site-packages/']' returned non-zero exit status 1
[jinja2 ERROR] command failed (code=1); raising
```
which is perplexing, because the files are there, if I execute the exact command by hand:
```
ondrej@kittiwake:~$ mv /auto/nest/nest/u/ondrej/repos/python-hpcmp2/opt/jinja2/h6cyfec/lib/python2.7/site-packages/*.egg/* /auto/nest/nest/u/ondrej/repos/python-hpcmp2/opt/jinja2/h6cyfec/lib/python2.7/site-packages/
ondrej@kittiwake:~$ ls /auto/nest/nest/u/ondrej/repos/python-hpcmp2/opt/jinja2/h6cyfec/lib/python2.7/site-packages/
easy-install.pth  EGG-INFO  jinja2  Jinja2-2.6-py2.7.egg  site.py  site.pyc
```
(This has been done for a different hash, but the same happens for the same hash.)
I wonder if there is any delay in unpacking it or something.