Change dump target in settings to /var/dump.

This will make use of new dump placing introduced by library change this
patch depends on. Dump will be on the same block device as /var/log,
which will make use of additional disk space available in /var/log.

Change-Id: Iec127e0d11194c7a89a2fb80203f173dc4ca3c98
Closes-bug: 1529182
Depends-on: I0c0832d0c10350898b16d68ed195677fcf975377

nailgun/nailgun/settings.yaml

@@ -738,7 +738,7 @@ MAX_ITEMS_PER_PAGE: 500
 SHOTGUN_SSH_KEY: "/root/.ssh/id_rsa"
 
 DUMP:
-  target: "/var/www/nailgun/dump/fuel-snapshot"
+  target: "/var/dump/fuel-snapshot"
   lastdump: "/var/www/nailgun/dump/last"
   timestamp: True
   compression_level: 3
@@ -828,6 +828,7 @@ DUMP:
         path: /var/log
         exclude:
           - atop/
+          - dump/
       - type: file
         path: /var/log/atop/atop_current
       - type: command