Add missing global statements to make SECRET_KEY and WEB_MGR_API_KEY work

[qris]

When the keys are to be created in the .secrets folder and not stored in the config.yml
file, base.py generates them and tries to assign to the global variables
SECRET_KEY and WEB_MGR_API_KEY so that the settings are complete. However this does
not work because the necessary global statements are missing, so the assignment is
to a local variable and does not go into the settings.

This causes the initial syncdb --migrate during installation (following the
instructions) to fail with this error:

$ sudo /opt/ganeti_webmgr/bin/django-admin.py syncdb --migrate --settings=ganeti_webmgr.ganeti_web.settings
Traceback (most recent call last):
  File "/opt/ganeti_webmgr/bin/django-admin.py", line 5, in <module>
    management.execute_from_command_line()
  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 443, in execute_from_command_line
    utility.execute()
  ...
  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/ganeti_webmgr/ganeti_web/search_indexes.py", line 3, in <module>
    from ganeti_webmgr.virtualmachines.models import VirtualMachine
  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/ganeti_webmgr/virtualmachines/models.py", line 5, in <module>
    from ganeti_webmgr.clusters.models import CachedClusterObject
  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/ganeti_webmgr/clusters/models.py", line 297, in <module>
    class Cluster(CachedClusterObject):
  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/ganeti_webmgr/clusters/models.py", line 309, in Cluster
    max_length=128, blank=True)
  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/django_fields/fields.py", line 50, in __init__
    self.cipher = self.cipher_object.new(settings.SECRET_KEY[:32])
  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/Crypto/Cipher/AES.py", line 95, in new
    return AESCipher(key, *args, **kwargs)
  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/Crypto/Cipher/AES.py", line 59, in __init__
    blockalgo.BlockAlgo.__init__(self, _AES, key, *args, **kwargs)
  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/Crypto/Cipher/blockalgo.py", line 141, in __init__
    self._cipher = factory.new(key, *args, **kwargs)
ValueError: Key cannot be the null string

This patch adds the missing global statements.

You might want to consider using Travis CI to ensure that the installation process stays well-tested?

[tschuy]

Hi!

Thanks for the PR. This is actually fixed in 0.11.2 with a slightly different approach. 0.11.2 is currently in rc, but should be ready soon.

@LyonesGamer @Kennric ping on status update on 0.11.2?