testing: Reduce runtime of all tests that use SQLite databases by storing them in ramfs

testing/tests/sql/multi-level-ca/test.conf

@@ -19,3 +19,7 @@ TCPDUMPHOSTS="moon"
 # Used for IPsec logging purposes
 #
 IPSECHOSTS="moon carol dave"
+
+# Guest instances on which databases are used
+#
+DBHOSTS="$IPSECHOSTS"