bootstrap-servers doesn't consider disabled AppArmor profiles

The task to remove the Libvirt AppArmor profile[1] doesn't consider the case where the profile exists but is disabled. That scenario raises the following error:

TASK [baremetal : Remove apparmor profile for libvirt] ******************************************************************************************************
fatal: [rasp4-node03]: FAILED! => {"changed": true, "cmd": ["apparmor_parser", "-R", "/etc/apparmor.d/usr.sbin.libvirtd"], "delta": "0:00:00.213067", "end": "2020-02-03 19:48:34.486978", "msg": "non-zero return code", "rc": 254, "start": "2020-02-03 19:48:34.273911", "stderr": "apparmor_parser: Unable to remove \"/usr/sbin/libvirtd\". Profile doesn't exist", "stderr_lines": ["apparmor_parser: Unable to remove \"/usr/sbin/libvirtd\". Profile doesn't exist"], "stdout": "", "stdout_lines": []}

This error can be avoided by adding an extra validation that checks the existence of a soft link on
`/etc/apparmor.d/disable/` folder

**Environment**:
* OS (e.g. from /etc/os-release):
NAME="Ubuntu"
VERSION="18.04.5 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04.5 LTS"
VERSION_ID="18.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=bionic
UBUNTU_CODENAME=bionic

* Kernel (e.g. `uname -a`):
Linux rasp4-node03 5.3.0-1036-raspi2 #38-Ubuntu SMP Thu Oct 15 14:40:03 UTC 2020 aarch64 aarch64 aarch64 GNU/Linux

* Kolla-Ansible version (e.g. `git head or tag or stable branch` or pip package version if using release):
kolla-ansible @ git+https://github.com/openstack/kolla-ansible@41677e97a69757d67f489ad700df11163e538c9a

* Docker image Install type (source/binary):
binary

[1] https://github.com/openstack/kolla-ansible/blob/10.1.0/ansible/roles/baremetal/tasks/post-install.yml#L142-L147