do not gzip legacy service logs

This change removes the .gz extension from the
service and syslog logs exported via journalctl.
This change nolonger gzip compresses the exported
logs so that they can be rendered in the browser
directly when served from swift.

Change-Id: I4557a737cb13b9c2406056be08ab8a32ddd45162
(cherry picked from commit d02fa6f856ac5951b8a879c23b57d5a752f28918)

roles/export-devstack-journal/tasks/main.yaml

@@ -14,7 +14,7 @@
       name=""
       for u in $(systemctl list-unit-files | grep devstack | awk '{print $1}'); do
         name=$(echo $u | sed 's/devstack@/screen-/' | sed 's/\.service//')
-        journalctl -o short-precise --unit $u | gzip - > {{ stage_dir }}/logs/$name.txt.gz
+        journalctl -o short-precise --unit $u  > {{ stage_dir }}/logs/$name.txt
       done
 
 - name: Export legacy syslog.txt
@@ -29,7 +29,7 @@
           -t sudo \
           --no-pager \
           --since="$(cat {{ devstack_base_dir }}/log-start-timestamp.txt)" \
-        | gzip - > {{ stage_dir }}/logs/syslog.txt.gz
+         > {{ stage_dir }}/logs/syslog.txt
 
 # TODO: convert this to ansible
 #  - make a list of the above units