papr.sh: use Fedora 28

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

Closes: #1244
Approved by: rhatdan

.papr.Dockerfile

@@ -1,4 +1,4 @@
-FROM registry.fedoraproject.org/fedora:26
+FROM registry.fedoraproject.org/fedora:28
 
 # NB: we also install python2 reqs here (which the builddep
 # does not catch since on F24 we build for py3) so that we

.papr.sh

@@ -43,7 +43,7 @@ if test -z "${INSIDE_CONTAINER:-}"; then
                --workdir /code \
                -e INSIDE_CONTAINER=1 \
                -e PYTHON=$PYTHON \
-               registry.fedoraproject.org/fedora:27 /code/.papr.sh
+               registry.fedoraproject.org/fedora:28 /code/.papr.sh
 
     # run the testsuite on the host
     if [ -z ${NO_TEST} ]; then

.papr.yml

@@ -4,11 +4,11 @@ branches:
   - try
 
 host:
-  distro: fedora/27/atomic
+  distro: fedora/28/atomic
   specs:
     secondary-disk: 10
 
-context: fedora/27/atomic
+context: fedora/28/atomic
 
 required: true
 
@@ -39,11 +39,11 @@ context: centos/7/atomic
 inherit: true
 
 host:
-  distro: fedora/27/cloud
+  distro: fedora/28/cloud
   specs:
     secondary-disk: 10
 
-context: fedora/27/cloud
+context: fedora/28/cloud
 
 # we install atomic to get the runtime reqs but of course,
 # its files will get overwritten by the containerized build