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

testing/tests/ikev2/ip-two-pools-v4v6-db/hosts/moon/etc/strongswan.conf

@@ -7,7 +7,7 @@ charon {
 libhydra {
   plugins {
     attr-sql {
-      database = sqlite:///etc/ipsec.d/ipsec.db
+      database = sqlite:///etc/db.d/ipsec.db
     }
   }
 }

testing/tests/ikev2/ip-two-pools-v4v6-db/posttest.dat

@@ -1,4 +1,3 @@
 alice::ip -6 route del default via fec1:\:1
 carol::ipsec stop
 moon::ipsec stop
-moon::rm /etc/ipsec.d/ipsec.*

testing/tests/ikev2/ip-two-pools-v4v6-db/pretest.dat

@@ -1,5 +1,5 @@
-moon::cat /usr/local/share/strongswan/templates/database/sql/sqlite.sql > /etc/ipsec.d/ipsec.sql
-moon::cat /etc/ipsec.d/ipsec.sql | sqlite3 /etc/ipsec.d/ipsec.db
+moon::cat /usr/local/share/strongswan/templates/database/sql/sqlite.sql > /etc/db.d/ipsec.sql
+moon::cat /etc/db.d/ipsec.sql | sqlite3 /etc/db.d/ipsec.db
 moon::ipsec pool --add v4_pool --start 10.3.0.1 --end 10.3.1.244 --timeout 48 2> /dev/null
 moon::ipsec pool --add v6_pool --start fec3:\:1 --end fec3:\:fe --timeout  48 2> /dev/null
 alice::ip -6 route add default via fec1:\:1

testing/tests/ikev2/ip-two-pools-v4v6-db/test.conf

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