Remove more commit message metadata from the svn logs for MFCs

I have intentionally left in PR: so it can be tracked via commit hooks
on Bugzilla

Requested by: jhb@FreeBSD.org

common/home/ngie/bin/mfc_log

@@ -23,6 +23,8 @@ for rev in $revisions; do
 		   -e "/^r${rev} /s/[[:space:]]*\|.*/\):/" \
 		   -e "s/ \(by ${ssh_user}\):/:/" \
 		   -e '/^MFC after:/d' \
+		   -e '/Differential Revision:/d' \
+		   -e '/(Reported|Reviewed|Sponsored) by:/d' \
 		   -e '/X-MFC with:/d' \
 		   -e 's/^ *$//g' \
 		   -e "/^r${rev}/s/^//" \