Fixes issue #6027.

The virtualenv parameter to the django_manage command is used to locate
the virtualenv and build it if necessary.  Access to the virtualenv
executable is only needed if the virtualenv directory doesn't exist and
needs to be built.  This patch allows for the situation where a
virtualenv that is not in the PATH was used to create a virtualenv prior
to running the django_manage module.

Fixes #3977

raise errors when omitted, updated changelog with new modules.

This commit removes the restriction on django management commands.  If a command is unknown to the django installation, there will be a concise error produced.

for example:

  tasks:
    - name: invalid command
      django_manage: virtualenv="/valid/virtualenv" app_path="/valid/app_path" command="nowaydude"

Results in:

failed: [hostname] => {"cmd": "python manage.py nowaydude", "failed": true}
msg: stdout: Unknown command: 'nowaydude'
Type 'manage.py help' for usage.

:stderr: Unknown django command: nowaydude

- passlib.apache.HtpasswdFile's 'default_scheme' was called 'default'
before passlib version 1.6
- while here also deal with passlib.apache.HtpasswdFile's older
'autoload' paramter vs the newer 'new' one.

Supervisord can be installed at the user level or system level.
Installating as a user is particularly useful for systems without root access.

Adds the ability to provide a custom supervisorctl executable path, supporting custom installations

Fixed the example.

Changed shebangs that use /usr/bin/env to use /usr/bin/python and therefore be compatible with the ansible_python_interpreter variable.

Adds more parameters which may be passed to supervisorctl:  config,
serverurl, username, password

Also refactored the various `module.run_command(build_a_string)` calls
into a single `run_supervisorctl` function.

Add a new module for managing entries in an htpasswd file, used
for basic authentication with web servers such as Apache and Nginx

The django 'migrate' command should receive the --noinput command,
otherwise it can block waiting for user input.

Signed-off-by: Jochen Maes <jochen@sejo-it.be>