TT#84555 Check debug and messages files as optional

These files are created by rsyslog with default conf file. Usually it's
done after the deployment.sh's reboot.

But when NGCP is installed via installer package on existing debian
system there is no reboot between installation of rsyslog (as part of
NGCP) and ngcp-initial-configuration which modifies /etc/rsyslog.conf.
So in this case these files are not created.

So check the ownership and permission of these files only if they exist.

Change-Id: I33be13a4e78baee3926de8bd0135d655b89d5bb6

templates/135_filesys-logfiles.yaml.tt2

@@ -42,20 +42,6 @@ file:
     group: adm
     filetype: file
 
-  /var/log/debug:
-    exists: true
-    mode: "0640"
-    owner: root
-    group: adm
-    filetype: file
-
-  /var/log/messages:
-    exists: true
-    mode: "0640"
-    owner: root
-    group: adm
-    filetype: file
-
 
   /var/log/ngcp/api.log:
     exists:
@@ -159,3 +145,51 @@ command:
       - '!/./'
     stderr:
       - '!/./'
+
+# optionally existing files
+
+  # /var/log/debug
+
+  "find /var/log/ -type f -name debug ! -user root":
+    exit-status: 0
+    stdout:
+      - '!/./'
+    stderr:
+      - '!/./'
+
+  "find /var/log/ -type f -name debug ! -group adm":
+    exit-status: 0
+    stdout:
+      - '!/./'
+    stderr:
+      - '!/./'
+
+  "find /var/log/ -type f -name debug ! -perm 640":
+    exit-status: 0
+    stdout:
+      - '!/./'
+    stderr:
+      - '!/./'
+
+  # /var/log/messages
+
+  "find /var/log/ -type f -name messages ! -user root":
+    exit-status: 0
+    stdout:
+      - '!/./'
+    stderr:
+      - '!/./'
+
+  "find /var/log/ -type f -name messages ! -group adm":
+    exit-status: 0
+    stdout:
+      - '!/./'
+    stderr:
+      - '!/./'
+
+  "find /var/log/ -type f -name messages ! -perm 640":
+    exit-status: 0
+    stdout:
+      - '!/./'
+    stderr:
+      - '!/./'