Install uWSGI from PyPI to repair CentOS 8 support

CentOS 8 does not have uWSGI, not even in EPEL:
https://bugzilla.redhat.com/show_bug.cgi?id=1757157

Since it's installable from PyPI, let's do it instead.
Also update SELinux to enable uWSGI+nginx to operate.

Change-Id: I44d0582e221e24404f427b261bf6d366f5c32775

playbooks/roles/bifrost-keystone-install/tasks/bootstrap.yml

@@ -284,3 +284,30 @@
 - name: "Remove uwsgi sysvinit init script"
   command: update-rc.d -f uwsgi remove
   ignore_errors: yes
+
+- block:
+    - name: "Explicitly allow keystone port (TCP) on selinux"
+      seport:
+        ports: "5000"
+        proto: tcp
+        setype: http_port_t
+        state: present
+
+    - name: Copy keystone policy file to temporary directory
+      copy:
+        src: keystone_policy.te
+        dest: /tmp/keystone_policy.te
+
+    - name: Check keystone policy module
+      command: checkmodule -M -m -o /tmp/keystone_policy.mod /tmp/keystone_policy.te
+
+    - name: Package keystone policy module
+      command: semodule_package -m /tmp/keystone_policy.mod -o /tmp/keystone_policy.pp
+
+    - name: Include keystone policy module
+      command: semodule -i /tmp/keystone_policy.pp
+
+    - name: Enable keystone policy module
+      command: semodule -e keystone_policy
+  when: (ansible_os_family == 'RedHat' or ansible_os_family == 'Suse') and
+         ansible_selinux.status == 'enabled' and ansible_selinux.mode == "enforcing"

playbooks/roles/bifrost-keystone-install/tasks/install.yml

@@ -45,6 +45,14 @@
     - skip_install is not defined
     - enable_venv | bool == true
 
+- name: "Install uWSGI in venv if using"
+  include: pip_install.yml
+    package=uWSGI
+    virtualenv=bifrost_venv_dir
+  when:
+    - skip_install is not defined
+    - enable_venv | bool == true
+
 - name: "Install python-openstackclient in venv if using"
   include: pip_install.yml
     package=python-openstackclient