Suppress more mac address formats.

Oregano produces messages like:
  oregano: [Battery] Remote battery status for the latest RCU used: [RCU2, dev_D4_F5_13_XX_XX_XX

Suppress mac addresses with underscore separator.

Change-Id: I1a482cb23a7920f54b24a57d87bb338b189e6ddf
diff --git a/cmds/logos.c b/cmds/logos.c
index 5a7f426..2f453d0 100644
--- a/cmds/logos.c
+++ b/cmds/logos.c
@@ -702,6 +702,7 @@
         ssize_t linelen = p - start;
         suppress_mac_addresses(start, linelen, ':');
         suppress_mac_addresses(start, linelen, '-');
+        suppress_mac_addresses(start, linelen, '_');
         suppress_media_filenames(start, linelen, "/var/media/pictures/");
         suppress_media_filenames(start, linelen, "/var/media/videos/");
         flush(header, headerlen, start, linelen);