supervisor-xqueue: Fix default values of nginx ports variables for xqueue/ora
supervisor-xqueue: Fix activation of virtualenv for ease installation

Source the `activate` file instead of attempting to execute it, which requires
execution rights.
supervisor-xqueue: Fix duplicate declaration of default variable `XQUEUE_BASIC_AUTH`

`XQUEUE_BASIC_AUTH` was declared twice for two different usages: activating/deactivating
the auth (boolean), and a [login, password] list. Split the second usage (login/password
list) into two separate variables, like the corresponding django_auth variables.
supervisor-xqueue: Allow ora to find its NLTK data (added to environment)

Since the data is not at a standard location anymore, set the location through
a environment variable, `NLTK_DATA`.
Merge pull request #382 from antoviaque/common-refactor-ora

Common refactor - Fix ora & xqueue