ceph-ansible-syntax: temporary fix CI error

ceph-ansible-syntax: temporary fix CI error

CI is failing at the moment because of a pip error:

```
+ /tmp/venv.x2V7jCYRmJ/bin/pip install pip==10.0.0
Traceback (most recent call last):
  File "/tmp/venv.x2V7jCYRmJ/bin/pip", line 11, in <module>
    load_entry_point('pip==19.1', 'console_scripts', 'pip')()
  File "/tmp/venv.x2V7jCYRmJ/lib/python2.7/site-packages/pkg_resources/__init__.py", line 565, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/tmp/venv.x2V7jCYRmJ/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2631, in load_entry_point
    return ep.load()
  File "/tmp/venv.x2V7jCYRmJ/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2291, in load
    return self.resolve()
  File "/tmp/venv.x2V7jCYRmJ/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2297, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/tmp/venv.x2V7jCYRmJ/lib/python2.7/site-packages/pip/_internal/__init__.py", line 40, in <module>
    from pip._internal.cli.autocompletion import autocomplete
  File "/tmp/venv.x2V7jCYRmJ/lib/python2.7/site-packages/pip/_internal/cli/autocompletion.py", line 8, in <module>
    from pip._internal.cli.main_parser import create_main_parser
  File "/tmp/venv.x2V7jCYRmJ/lib/python2.7/site-packages/pip/_internal/cli/main_parser.py", line 8, in <module>
    from pip._internal.cli import cmdoptions
  File "/tmp/venv.x2V7jCYRmJ/lib/python2.7/site-packages/pip/_internal/cli/cmdoptions.py", line 24, in <module>
    from pip._internal.utils.ui import BAR_TYPES
  File "/tmp/venv.x2V7jCYRmJ/lib/python2.7/site-packages/pip/_internal/utils/ui.py", line 11, in <module>
    from pip._vendor.progress import HIDE_CURSOR, SHOW_CURSOR
ImportError: cannot import name HIDE_CURSOR
```

since I'm unsure we really need to pin pip to 10.0.0 for the syntax
check job let's not use `install_python_packages` function from
`build_utils.sh` to install `ansible-lint`.

I'll revert this patch as soon as I'll have figured out the proper fix
to apply.

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>