Switch from fedora-26 to fedora-27 testing

Now that we have fedora-27 images online, start testing against that.

It also seems that pip3 will use /usr/local so we can remove override
from systemd for fedora.

  https://fedoraproject.org/wiki/Changes/Making_sudo_pip_safe

Change-Id: Ic47121b0d13936795980c433ee52cc1c6e11b2cd
Depends-On: https://review.openstack.org/543013/
Depends-On: https://review.openstack.org/543019/
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

.zuul.yaml

@@ -8,9 +8,9 @@
       - zuul: openstack/ansible-role-nodepool
 
 - job:
-    name: ansible-role-nodepool-fedora-26
+    name: ansible-role-nodepool-fedora-27
     parent: ansible-role-nodepool
-    nodeset: fedora-26
+    nodeset: fedora-27
 
 - job:
     name: ansible-role-nodepool-ubuntu-xenial
@@ -20,15 +20,15 @@
 - project:
     name: openstack/ansible-role-nodepool
     templates:
-      - windmill-jobs-fedora-26
+      - windmill-jobs-fedora-27
       - windmill-jobs-xenial
     check:
       jobs:
-        - ansible-role-nodepool-fedora-26
+        - ansible-role-nodepool-fedora-27
         - ansible-role-nodepool-ubuntu-xenial
         - tox-linters
     gate:
       jobs:
-        - ansible-role-nodepool-fedora-26
+        - ansible-role-nodepool-fedora-27
         - ansible-role-nodepool-ubuntu-xenial
         - tox-linters

templates/etc/systemd/system/nodepool-builder.service.d/redhat.conf

@@ -1,5 +1,3 @@
 # This file is generated by Ansible
 #  DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
 #
-[Service]
-Environment="PREFIX=/usr"

templates/etc/systemd/system/nodepool-launcher.service.d/redhat.conf

@@ -1,5 +1,3 @@
 # This file is generated by Ansible
 #  DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
 #
-[Service]
-Environment="PREFIX=/usr"