Make it possible to have multiple active certificates with the same
subject.

apps/openssl.cnf

diff --git a/apps/openssl.cnf b/apps/openssl.cnf
index eca51c3..2696044 100644
--- a/apps/openssl.cnf
+++ b/apps/openssl.cnf
@@ -38,6 +38,8 @@
 certs		= $dir/certs		# Where the issued certs are kept
 crl_dir		= $dir/crl		# Where the issued crl are kept
 database	= $dir/index.txt	# database index file.
+#unique_subject	= no			# Set to 'no' to allow creation of
+					# several ctificates with same subject.
 new_certs_dir	= $dir/newcerts		# default place for new certs.
 
 certificate	= $dir/cacert.pem 	# The CA certificate