Exclude /etc/hostname

Similar to the previous patch where we excluded /etc/hosts, it turns out
that /etc/hostname is also a special file that cannot be synced in via
kolla because they are bindmounted internally.

6ac009d530/libpod/container_internal_linux.go (L1236)

Additionally this change includes cleanup for end users who may have hit
LP#1860607 and allows folks who have hit this to just simply rerun the
deployment and not have to manually cleanup the synced files.

Change-Id: I84287d9c1ef110511c66743f9a3a22709077b0cb
Closes-Bug: #1885619

common/container-puppet.sh

@@ -101,7 +101,7 @@ if [ -z "$NO_ARCHIVE" ]; then
     ro_files="/etc/puppet/ /etc/puppetlabs/ /opt/puppetlabs/ /etc/pki/ca-trust/extracted "
     ro_files+="/etc/pki/ca-trust/source/anchors /etc/pki/tls/certs/ca-bundle.crt "
     ro_files+="/etc/pki/tls/certs/ca-bundle.trust.crt /etc/pki/tls/cert.pem "
-    ro_files+="/etc/hosts /etc/localtime"
+    ro_files+="/etc/hosts /etc/localtime /etc/hostname"
     for ro in $ro_files; do
         if [ -e "$ro" ]; then
             exclude_files+=" --exclude=$ro"
@@ -118,7 +118,6 @@ if [ -z "$NO_ARCHIVE" ]; then
     echo "Rsyncing config files from ${rsync_srcs} into ${conf_data_path}"
     rsync -a $verbosity -R --delay-updates --delete-after $exclude_files $rsync_srcs ${conf_data_path}
 
-
     # Also make a copy of files modified during puppet run
     echo "Gathering files modified after $(stat -c '%y' $origin_of_time)"
 
@@ -139,6 +138,16 @@ if [ -z "$NO_ARCHIVE" ]; then
     rsync -a $verbosity -R -0 --delay-updates --delete-after $exclude_files \
         --files-from=$TMPFILE2 / ${puppet_generated_path}
 
+    # Cleanup any special files that might have been copied into place
+    # previously because fixes for LP#1860607 did not cleanup and required
+    # manual intervention if a container hit this. We can safely remove these
+    # files because they should be bind mounted into containers
+    for ro in $ro_files; do
+        if [ -e "${puppet_generated_path}/${ro}" ]; then
+            rm -rf "${puppet_generated_path}/${ro}"
+        fi
+    done
+
     # Write a checksum of the config-data dir, this is used as a
     # salt to trigger container restart when the config changes
     # note: while being excluded from the output, password files