kdc: Fix audit_addkv() typos and reason handling

Now we'll put the "reason=..." last in the log lines and we won't escape
spaces -- just newlines and other control characters.  This makes
reading log lines much easier without complicating parsing of log lines
because interior key=value pairs do get whitespace escaped or removed.

kdc/version-script.map

@@ -21,6 +21,7 @@ HEIMDAL_KDC_1.0 {
 		krb5_kdc_update_time;
 		krb5_kdc_pk_initialize;
 		_kdc_audit_addkv;
+		_kdc_audit_addreason;
 		_kdc_audit_trail;
 
 		# needed for digest-service