dump: allow to have datastore vars on dump commands

This allows to have datastore variables in the dump
commands and will get the data when a new instance
it's created.

Also this remove special cases from the commands.

[YOCTO #8118]

(From OE-Core rev: 384927eb8d52bc5f14c63c8421aa62ee859587f0)

Signed-off-by: Mariano Lopez <mariano.lopez@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/testimage.bbclass

@@ -63,11 +63,14 @@ testimage_dump_target () {
     ps
     free
     df
-    _ping
+    # The next command will export the default gateway IP
+    export DEFAULT_GATEWAY=$(ip route | awk '/default/ { print $3}')
+    ping -c3 $DEFAULT_GATEWAY
     dmesg
     netstat -an
     ip address
-    _logs
+    # Next command will dump logs from /var/log/
+    find /var/log/ -type f 2>/dev/null -exec echo "====================" \; -exec echo {} \; -exec echo "====================" \; -exec cat {} \; -exec echo "" \;
 }
 
 testimage_dump_host () {