Fix ansible version in install command

There are no 5.* versions of ansible for CentOS 8 Stream yet.
One should use pip install 'ansible>=4,<6' according to the
current documentation.

Closes-Bug: #1969617
Change-Id: Ie4f502f955dac5ae9ee8ddb4779c2fa2e26840d9

doc/source/user/quickstart.rst

@@ -96,7 +96,7 @@ If not installing Kolla Ansible in a virtual environment, skip this section.
 
    .. code-block:: console
 
-      pip install 'ansible==5.*'
+      pip install 'ansible>=4,<6'
 
 Install dependencies not using a virtual environment
 ----------------------------------------------------
@@ -147,7 +147,7 @@ If installing Kolla Ansible in a virtual environment, skip this section.
    .. note::
 
       If the installed Ansible version does not meet the requirements, one can
-      use pip: ``sudo pip install -U 'ansible==5.*'``.
+      use pip: ``sudo pip install -U 'ansible>=4,<6'``.
       Beware system package upgrades might interfere with that so it
       is recommended to uninstall the system package first. One might be better
       off with the virtual environment method to avoid this pitfall.

doc/source/user/virtual-environments.rst

@@ -26,7 +26,7 @@ python virtual environment on the Ansible control host. For example:
    source /path/to/venv/bin/activate
    pip install -U pip
    pip install kolla-ansible
-   pip install 'ansible==5.*'
+   pip install 'ansible>=4,<6'
    deactivate
 
 To use the virtual environment, it should first be activated: