Add ansible-core as a dependency

This patch adds ansible-core as a dependency to
requirements.txt since there is really no reason
not to have it in the requirements.txt, given that
kolla-ansible project even has ansible in its name
and ansible-core is a crucial dependency.

Change-Id: I4d01b7eb944c4edf6a440f2b775221986509f7eb

requirements.txt

@@ -10,7 +10,8 @@ hvac>=0.10.1 # Apache-2.0
 # templating
 Jinja2>=3 # BSD License (3 clause)
 
-# Ansible's json_query
+# Ansible and ansible's json_query
+ansible-core>=2.16,<2.18 # GPLv3
 jmespath>=0.9.3 # MIT
 
 # ini parsing

test-requirements.txt

@@ -5,4 +5,3 @@ coverage!=4.4,>=4.0 # Apache-2.0
 docker>=2.4.2 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 stestr>=2.0.0 # Apache-2.0
-ansible>=6,<8 # GPLv3