Create dbs with correct permissions.

lib/commonio.h

@@ -123,6 +123,12 @@ struct commonio_db {
 #ifdef WITH_SELINUX
 	/*@null@*/security_context_t scontext;
 #endif
+	/*
+	 * Default permissions and owner for newly created data file.
+         */
+	mode_t st_mode;
+	uid_t st_uid;
+	gid_t st_gid;
 	/*
 	 * Head, tail, current position in linked list.
 	 */