Drop part for supporting ansible 2.9 and 2.10 (#9842)

requirements-$ANSIBLE_VERSION.yml doesn't exist in Kubespray repo.
That was for supporting ansible 2.10-, and now Kubespray supports
2.11+. So this drops the part to avoid confusion.

docs/ansible.md

@@ -15,9 +15,6 @@ virtualenv  --python=$(which python3) $VENVDIR
 source $VENVDIR/bin/activate
 cd $KUBESPRAYDIR
 pip install -U -r requirements-$ANSIBLE_VERSION.txt
-test -f requirements-$ANSIBLE_VERSION.yml && \
-  ansible-galaxy role install -r requirements-$ANSIBLE_VERSION.yml && \
-  ansible-galaxy collection -r requirements-$ANSIBLE_VERSION.yml
 ```
 
 ### Ansible Python Compatibility

tests/scripts/testcases_prepare.sh

@@ -9,10 +9,3 @@ mkdir -p /.ssh
 mkdir -p cluster-dump
 mkdir -p $HOME/.ssh
 ansible-playbook --version
-
-# in some cases we may need to bring in collections or roles from ansible-galaxy
-# to compensate for missing functionality in older ansible versions
-if [ -f requirements-${ANSIBLE_MAJOR_VERSION}.yml ] ; then
-  ansible-galaxy role install -r requirements-${ANSIBLE_MAJOR_VERSION}.yml
-  ansible-galaxy collection install -r requirements-${ANSIBLE_MAJOR_VERSION}.yml
-fi